Inspiring our next generation to think for themselves about nature, the environment, and their role as future stewards of their world.

Explore Your World!

Key

  • Elementary School Lesson Guide
    Elementary School Lesson Guide
  • Middle School Lesson Guide
    Middle School Lesson Guide
  • High School Lesson Guide
    High School Lesson Guide
  • Video Content
    Video

Not sure where to start? Choose a category!

    • Energy Science
    • Decoding the Science of Crude Oil Formation
      OiForms3

      Well, wonder no more. Discover for yourself in this Serious Science video that decodes the mysteries of crude oil. Explore the science behind the formation of crude oil from ancient sea creatures and the petroleum geology that’s responsible for it collecting in reservoirs that can be tapped into by humans. Speaking of us humans, why do we depend so much on crude oil in the first place that impacts almost every aspect of our lives? Click the video below to wade into the sometimes complex science of hydrocarbons.

    • Life Cycles of Fuels
      carbon converted

      Driving vehicles powered by fossil fuels converts millions of year's worth of prehistoric trapped carbon within the earth's crust into carbon dioxide expelled into today's atmosphere. In the past 200 years alone, the industrial revolution has caused CO2 levels to rise from 280 ppm to 400 ppm. The increase in atmospheric CO2 creates the problems associated with climate change impacting marine and terrestrial ecosystems around the earth. What's the solution? It starts with exploring the CO2 life cycles of different types of fuels that you'll discover in this introduction video that can be used with the four free companion Middle and High School lesson activities below from the Great Lakes Bioenergy Research Center.

    • Turning Crude Oil Into Fuels
      PineBend

      Unlock the answers to the physics, chemistry and science of hydrocarbons as you watch this video. You'll discover the technology of how oil is transported through pipelines to one of the most advanced oil refineries in North America. There, we'll explore the technologies used throughout the refining process, and discover how the refinery conserves natural resources. So start “refining” your knowledge by watching this video, then dive into extended classroom learning by using the Discussion Guide (coming soon!).

    • Decoding Industrial Sand Mining
      sand mining

      Discover this answer and more by watching the video below. Learn more about the geology of sand deposits, how frac-sand is mined and processed, how a sand mine company limits their environmental impact, and even how they are helping to preserve an endangered butterfly species. Click the link to the discussion guide below to take this learning into your classroom. If you want to “dig deeper” into frac-sand mining, check out the website of the educational partner that supported this video and lesson content, Unimin.

    • Corn Ethanol – Fueling Options for the Future
      corn

      Learn more about one of corn’s most famous by-products, ethanol, in the Serious Science video below. Discover where it comes from, how it’s processed, and the biochemical reactions involved in turning into fuel. Then, have your teacher click on the lesson guide to find out more about this fascinating fuel. Be sure to check out the website of our educational partner who supported the video and lesson content by clicking the link below.

    • Ethanol Primer
      CornHarvest

      Find out by watching the Serious Science ethanol video below. Follow the process of ethanol production from how corn is grown, to how it’s harvested, to how it gets turned into fuel. Then, click the lesson links below to share and learn even more in your classroom about this "a-maize-ing" biochemical process. You'll also find more educational links below including those of our educational partner the Wisconsin Corn Growers who supported the video and lesson content for you and your class to learn from. Click on their logo below to explore more background information on corn and ethanol production.

    • Environmental Science
    • Household Hazardous Waste
      Mad at waste

      Find the answers to these questions and more by watching this video. You’ll learn what happens when hazardous waste enters the environment, what impacts the waste can have on the environment and on us, and, most importantly, what we can all do about reducing those wastes and their risks. Dealing with hazardous waste is far from fun, but learning about it definitely can be. Click on the games and lessons below to see how.

    • Plants and Us
      Screen Shot 2016-06-13 at 1.53.23 PM

      Find out in this Serious Science video. The hosts, Josh and Caroline, help you discover the variety of benefits that plants offer to help you make your own value-based decision about the role trees and plants play in our lives. After watching the video, check out the free lesson activities below to take this learning into your classroom. And be sure to also click the link of the educational partner that supported this video!

    • Sand Mining and Ecosystems
      butterfly

      A mine reclamation plan is a critical part of any mining operation, including sand mines. A crucial part of that plan involves the identification of key wildlife species that inhabit that area before mining begins. See how one mine not only reclaims the visual landscape, but considers specific abiotic and biotic factors that help restore displaced species - both big and small.

    • Environmental Impacts of Sand Mining
      water table wells

      The sand mining operation at Tunnel City uses lots of water during the various parts of their processing and mining operations. In fact, they use 15,000 gallons per minute all day long. Yet they only need to pump fresh water from the aquifer once every few months. Yeah, we know that math doesn't equate. So what's their secret? Keep reading and watch the video below.

    • Exploring Glacial Features
      google earth map

      Discover the answers to these questions and more by watching the Serious Science video below. Learn to identify different glacial features by sight and by using the computer. Someday, you can hit the Ice Age Trail and be able to locate interesting sights all along the way. How “cool”. Next, check out the companion lesson below to uncover even more Ice Age mysteries. Do you feel like getting out on the trail yourself? Click the link below to visit the page of the Ice Age Trail Alliance. They supported the video content and lesson activity you see here. Their site will give you all of the info you need to hit the trail with your family and friends.

    • Ice Age Trekking
      girl woman overlook river

      Put your pack on and hit the trail with the hosts in this Serious Science video as they look for evidence of glaciers on the Ice Age Trail. Find out how you can safely uncover one of the most unique and interesting trails in the Upper Midwest. Check out the video to learn what it takes to uncover Ice Age mysteries along the trail. Next, check out the lesson below to learn about how you can safely discover pieces of the Ice Age Trail and identify its interesting parts along the way. Do you feel like getting out on the trail yourself? Click the link below to visit the page of the Ice Age Trail Alliance. They supported the video content and lesson activity you see here. Their site will give you all of the info you need to hit the trail with your family and friends. See you on the trail.

    • Glacial Geology Matters
      mountain glacier

      Find out by watching this Serious Science video! Between 2.3 million years ago and 12,000 years ago, glaciers covered much of the Midwest landscape. These rivers of ice carved much of the terrain and deposited a variety of sediments. Imagine a 300-foot-tall bulldozer making its way across Wisconsin. Now you get the idea. Check out the companion lesson guide below to “reshape” your understanding of glacial geology. Do you feel like getting out on the trail yourself? Click the link below to visit the page of the Ice Age Trail Alliance. They supported the video content and lesson activity you see here. Their site will provide you with even more learning opportunities.

    • The Driftless Area
      google earth map

      You’ll get the drift by watching this Serious Science video. The driftless area gets its name from the total lack of glacial drift material in the southwest corner of Wisconsin. The area is home to unique species found nowhere else and is home to many other mysteries. If you want to solve even more mysteries, check out the link to “Mysteries of the Driftless” below. Drift on down to the companion lesson guide to take your learning even further. Make sure you take a look at the page of our educational partner, The Ice Age Trail Alliance, to get even more facts about glaciers and their effect on the landscape. And be sure to click on the page of our educational buddies at Untamed Science to view the Emmy-winning documentary about the driftless area, “Mysteries of the Driftless”.

    • Wetlands Water Cycle
      areial view of marsh

      Find out by checking out the Serious Science video below. Evaporation, precipitation, condensation, and much more are covered in the video. Plus, you’ll get to see how wetlands help provide us with the water we need. We hope you brought your umbrella. To dive into the deep end of wetland water cycles, explore the companion lesson guide below. Plus, the educational partner noted below supported the video and lesson content you see here. They offer more learning opportunities on their website. Click their logo to check these out.

    • Water Pollutions & Solutions
      Zaire paddles

      Discover the answers by watching the 23-minute video below as you wade into the science of water pollution. Find out what can be done by whom to save lakes threatened by toxic cyanobacteria, how some botanical gardens recycle water in creative ways, why karst topography is critical to drinking water, and how an entire watershed was restored by science-driven partnerships. Ready to take the plunge? This online video is only the tip of the educational iceberg that's coming soon into classrooms across the county. We're also creating four separate Serious Science videos and companion classroom lesson activities that explore the STEM (science, technology, engineering, math) and social aspects of water pollution while igniting peer-driven critical thinking. If you want to know more about what is being done by whom to protect our precious surface and ground waters, visit the website of the educational partner that supported this production... our friends in conservation at Wisconsin Land+Water.

    • Glacial Geology
      water from glacier

      Put your pack on and hit the trail with Josh and Caroline as they look for evidence of glaciers on the Ice Age Trail. You will want to “chill” and watch all four parts of the video series so you don’t miss anything. Discover drumlins, potholes, and even a snake as you follow along on the trail. Next, check out the lesson below to solve even more Ice Age mysteries. Do you feel like getting out on the trail yourself? Click the link below to visit the page of the Ice Age Trail Alliance. They supported the video content and lesson activity you see here. Their site will give you all of the info you need to hit the trail with your family and friends. See you on the trail!

    • Dairy Farm Sustainability
      MissionControl.STracker.methane

      Moo-ve on down to the video link below and watch all four parts of this video to learn more. You may not have expected Einstein’s Law of Thermodynamics, biochemical processes, and dairy farms to be so related but… that’s the wonderful thing about science. You never know what may be interconnected. When you’ve finished watching the videos, check out the lesson and resource links to become a sustainability expert. The educational partner noted below supported the content here so be sure to check out their website to get even more information.

    • Wetlands Ecology
      Caroline with marsh water

      Don your boots and wade into the four-part video series below. You will discover the wonder of how wetlands work, and why they are so critical to our own survival. It may surprise you just how many wetlands here in the United States have vanished, but you’ll be encouraged to see how those that remain are being studied and protected. Have your teacher download the companion discussion guide or lesson below to take some wetland wisdom into the classroom. Plus, the educational partner noted below supported the video and discussion guide content here for all of us to learn from. They offer other learning opportunities on their website. Click their logo to discover more.

    • Farm Science
    • Soybean Sustainability
      Screen Shot 2016-06-09 at 11.09.26 AM

      Explore the answers by reading below, and look for the episode to be broadcast on June 18/19. Our hosts ask a variety of experts to help them unlock the secrets of soybean sustainability in farms, businesses, communities, and transportation hubs. From kayaking down the Mississippi River to hanging out with the coolest soybean around, Coolbean, they seek the science and help you understand it. Check out the link below to learn more about the educational partner that supported this episode. Encourage your teacher to download the free discussion guide below to take your learning even further.

    • Cattle in the Environment
      GrazingCattle

      Cows provide most Americans with food. Mmm. But it is important to remember that beef production has the potential to really affect the environment. Fortunately, as you will see in the Serious Science video below, the majority of beef producers are committed to being good stewards of the environment. Learn how cattle are raised in a humane and environmentally-friendly way by viewing the Serious Science video below. Next, have your teacher download the free discussion guide to learn even more. Click the link below to find out more about the educational partner that supported this video and lesson content.

    • History of Soy
      GW Carver in class

      Venture back in time by watching the Serious Science video below. Discover how soy has been a central part of cultures for thousands of years and learn why soybeans have become one of the most important crops in human history. There is soy much history that you'll want to click on the lesson guide below to take your learning into your classroom. Ask your teacher to download the free guide. No cost = big fun. The educational partner below supported the video content for all of us to learn from. Click their link below for bonus learning opportunities and to develop the important skill of gathering information from a variety of sources.

    • Beef Farming & Consumption
      ITO_1203_ScreenGrab

      Find out by watching the four parts to the video series. You will go onto a cattle farm to see beef production in action and meet some of its friendly inhabitants. Take advantage of this “rare” opportunity to meet your meat. When you finish watching all four parts, I think you’ll agree that the videos are all very “well done”. Next, click on the elementary or middle school discussion guides to learn even more about the meat you eat. Make sure you check out the website of the educational partner that supported the video content you see here. The link is below.

    • Soybean Farming
      tractor comes

      Discover the answers to these questions and more by watching the Serious Science video below. Learn how Wisconsin can provide almost half of the world’s soybean needs and what these little beans do for humans and animals. This short video is will expand your brain "soy much" more. To take your learning even further, click on the free companion lesson guide below. Plus, the educational partner noted below supported the video and lesson content you see here. They offer more learning opportunities on their website. Click their logo to check them out.

    • Beef Farming
      GrazingCattle

      Unless you’re a farmer yourself, this Serious Science video will be the closest many of us will come to experiencing life on a beef farm. Watch the video to see how cows are fed, cared for, and moo-ved. In addition, you will learn about many products made from cows that don’t involve food at all. Hold off on that hamburger just a little longer and explore the lesson activity to meet your meat. Make sure to click the logo of the educational partner that supported this video and lesson content for us all to learn from. They offer even more learning opportunities on their website.

    • A-maize-ing Corn
      harvesttrailer

      Discover more by watching the Serious Science video below. You will learn all about the impact of corn on our society, how it is farmed sustainability, and even some of the science behind how it grows. To discover even more about corn, check out the lesson activities below. The educational partner listed below supported the video and lesson content, so be sure to visit their web page as well.They offer additional lesson activities along with more details about corn production in the Upper Midwest.

    • Soybean Science
      soybeans

      Watch all four parts of this video series to reveal the answers. From the background of soybeans to the technology involved in their production, you’ll be “soy” knowledgeable about this very important crop. Become even more soy savvy by downloading the companion discussion guide below. The educational partner below supported the video content for all of us to learn from. Click the link below for even more learning opportunities and to develop the important skill of gathering information from a variety of sources.

    • Dairy Science
      kids in cow barn

      Discover the answers by watching all four parts of this video series. Follow Josh and Caroline as they moo-ve throughout dairy farms, exploring the science all along the way. Check out the two lesson activities below for even more learning opportunities. Make sure to click the logo of the educational partner that supported this video and lesson content for us all to learn from. They offer even more learning opportunities on their website.

    • Aquaculture Science
      Fishfarming is fun

      If fish farming, also known as aquaculture, is news to you, don’t worry. The Serious Science video below will fill you in on how aquaculture works. You will also learn about aquaponics, where the waste from the fish is used as fertilizer for growing crops. And the crops are grown in the same water that the fish use. Talk about surf and turf. Click on the discussion guide below and the lesson activity to learn more about this topic and to put into practice what you learned in the video.

    • Health Science
    • Beef Food Safety
      various.Cattle

      Learn the answers to these questions and more in the Serious Science video below. The beneficial role of beef is highlighted, as are the intense precautions that the beef industry takes to keep our food safe. To take your learning even further, download the elementary or middle school lesson guide below. Click the link below to find bonus information about the educational partner that supported this video and lesson content.

    • Lyme Disease Science
      Screen Shot 2016-04-06 at 11.43.12 AM

      Learn about Lyme Disease and what you can do to both prevent and treat it by watching the video below. The video outlines how Lyme Disease spreads from ticks to humans and the symptoms to watch out for. Additionally, you will see real people who have contracted Lyme Disease and what they are doing to fight its effects. To get more insight into how Lyme Disease, and many other diseases, can be prevented, please visit the page of the educational partner listed below who supported this content.

    • Safe Outdoor Adventuring
      Kayakers ready to race

      Find out by watching the four parts to this video series. Discover how the ITO adventure team complete challenges testing their ability to work together, solve problems, and physically handle a true eco-trek. Whether they're paddling rivers or venturing deep below ground, our team learns about staying fit, outdoor safety, plus caring the environment. And, of course, how to have a great time into the outdoors. Embark on an educational journey of your own by clicking on the lesson links below. Before you get to the finish line, check out the link to the educational partner who supported this video series which helps teach all of us how to be safe outdoors.

    • Personal Wellness
      personalwellnesscover

      Watch the videos below to learn how. Here at Into the Outdoors, we believe in exploring. Discovering the mysteries of nature is not only a great way to learn, but it's also a lot of fun. These days, more and more kids are spending time inside in front of technology and we want to provide a resource for kids so that they can see the benefit of spending time outside. Check out the videos below to see how you can become a healthier and more outdoor-oriented individual. Be sure to check out the YouTube page of our friends at WCA Group Health Trust for lots of bonus health videos and wellness resources.

    • Life Science
    • Discovery of Nitrogen Fixation
      nitroconversion Soy

      George Washington Carver is one of the most famous botanists, or plant scientists, in U.S. history. His discovery of nitrogen fixation essentially saved many of the fields, and the farmers that depended on those fields, in the American South. Nitrogen fixation is where legumes, like soybeans, alfalfa, and peanuts are planted every other year in cotton fields to enrich the soil with beneficial nitrogen. Watch the Serious Science video below to learn how this amazing man made such an incredible discovery. Make sure to open the discussion guide below to “plant the seed” in your brain about nitrogen fixation. The guide gives you all the tools you need to do this so “plow” ahead by clicking below. Don’t forget to click on the link below to check out the website of the educational partner that supported the video and discussion guide content.

    • Becoming A Wetlands Ecologist
      two people test water

      Find out by checking out the Serious Science video below. Wetlands ecologists go out into the middle of wetlands, collect data, and piece together the complex relationships between wetland species. Do you like getting wet, muddy, and surrounded by wildlife? Explore a wetland near you and see if you have what it takes to be a wetland ecologist. To learn more about how to get involved with wetlands in your area, download the companion lesson guide below. Plus, the educational partner noted below supported the video and lesson guide content you see here. They offer more learning opportunities on their website. Click their logo to explore.

    • Comparing Fish Life Cycles
      troutsturgeon

      Dive into this topic and by watching the Serious Science video below. You’ll be transported underwater to compare and contrast two well-known fish species here in the Upper Midwest. Don’t worry…. you don’t have to hold your breath for too long. Gulp down the contents of our lesson activity by clicking on the link below. Make sure to click the logo of the educational partner that supported this video and lesson content for us all to learn from. They offer even more learning opportunities on their website.

    • Native American Relationship with Sturgeon
      NAfishing

      Find out by watching this Serious Science video. You’ll learn about the relationship the Menominee Tribe has with the sturgeon, why the sturgeon is being monitored these days, and you will see just how big these prehistoric creatures can grow. Take a step back in time as you explore the topic further in your classroom using our free lesson guide below. Make sure to click the logo of the educational partner that supported this video and lesson content for more insight into the Menominee Tribe. They offer extra learning opportunities on their website.

    • Beef In Your Diet
      2006_78_ 362

      Learn the answers to these questions and more in the Serious Science video below. You may be surprised about just how beneficial beef can be to human health. To take your learning even further, download the elementary or middle school lesson guide below. Click the link below to discover more about the educational partner that supported this video and lesson content.

    • Plants and Pollinators
      bumblebee

      Learn even more facts about the important role of pollinators in this Serious Science video. You’ll discover the science of how plants reproduce, and how pollinators help them develop fruit and spread their seeds. The video explains how plants use nitrogen fixation to develop after pollination and how plants depend on the water cycle over time. To explore this topic even further, download the free lesson activities below.

    • Animal Adaptations
      WinterSurvivors

      Discover what animals do to survive, and even thrive, when surviving isn’t so easy. From bumblebees to humans, you will learn how animals adapt to their environment by watching all four parts of this video series. You can learn in your classroom by checking out the discussion guide for these videos. Be sure to check out the website of our educational partner who supported the video content for even more learning opportunities.

    • The Science of Torpor
      chipper

      Discover the answers to these questions and more by watching this Serious Science video. You’ll realize just how astounding animals can be when they need to get through harsh winters, and your warm home will feel that much more comfortable. Make sure to download our lesson to discover more about this fascinating subject. Oh, and you can’t forget to click on the link of the educational partner that supported this video content. They have extra learning opportunities on their website.

    • Black Bear Biology
      2fite

      Discover the answers to sharing the landscape with bears by watching this Serious Science video and reading the information below. And to take this learning adventure into your classroom, have your teacher download the free Lesson Activity at the bottom of this page so everyone can share in the fun of this inquiry based learning.

    • Natural Resource Science
    • Sustainable Forestry
      woman by logs

      Watch this Serious Science video to discover how forests can provide humans with countless resources and animals with places to live. See how forests can be managed in a sustainable way. Paul Bunyan has nothing on today’s modern foresters. Then, take a short-CUT to learning by downloading the lesson below. The Great Lakes Timber Professionals Association was the educational partner that supported this video. Check out their website for bonus information on how forests are managed in the Great Lakes Region.

    • Technology In Conservation
      FishOperate

      Find out by watching this Serious Science video. You’ll learn how the field of conservation science has changed and why technology is a central part of saving wildlife today. You’ll be… shocked! Slide on down to the companion lesson guide to expand into classroom learning about fish conservation. Make sure to click the logo of the educational partner that supported this video and lesson content for us all to learn from. They offer extra learning opportunities on their website.

    • Biological Carrying Capacity
      sturgeon near surface

      Fortunately, for every animal on Earth, there is balance. This balance is what scientists call "biological carrying capacity". Explore this important topic by watching the Serious Science video below. Also check out the free lesson guides that will help you and your class learn even more about the balance that exists in nature. The educational partner below supported the video content. Click their link to bonus learning opportunities.

    • Sturgeon Conservation
      sturgeon underwater

      Discover if there are indeed dinosaurs among us, or if that's just nonsense, by watching the four parts of this video series. You might be surprised by what you learn about one of the largest fish inhabiting the Great Lakes region and what is being done to prevent it from following the fate of most other prehistoric creatures. Don’t forget to dive into the discussion guide below to get even more background on sturgeon conservation. If you're a high school student, have a look at the lesson activity that will you to build off what's in the discussion guide. The educational partner below supported the video content. Click their link to access bonus learning opportunities.

    • Forest Ecology
      woman gauges tree

      Forests are dynamic, meaning that they are always changing. Discover the changes that forests go through, the different types of forests, and how trees are harvested by watching all four parts of this science video. Then, take a short-CUT to learning by downloading the lesson below. The Great Lakes Timber Professionals Association was the educational partner that supported this video. Check out their website for bonus information on how forests are managed in the Great Lakes Region.

    • Physical Science
    • Chemistry of Life
      boy purs oil in liquid

      If you don’t know the answers to these questions, watch the four videos in this video series. Follow Josh and Caroline as they trek from a jungle to a laboratory that seeks to uncover the mysteries of milk. Ask your teacher to download the lesson activity below that allows you to build your knowledge about the chemistry of life. Don’t forget to check out the website of the educational partner that supported this video content. You’ll learn tons of new stuff about the ins and outs of the dairy industry there as you moo-ve through their website.

    • Technology & Engineering of Sand Mining
      aerial crusher

      So how do sand miners extract select zones of quality industrial sand without blasting ancient sandstone formations to smitherines? And how can they possibly work in a massive mine operation without impacting the air quality as they generate silica dust? Watch the video below to discover the technology and engineering that make it possible.

    • Technology of Soy
      car at museum

      Watch this Serious Science video to reveal the answers. From the technology involved in soybean production to Henry Ford’s role in developing soybean products, you’ll be “soy” knowledgeable about this very important crop. Share this video with your classroom and take your learning to another level by downloading our free companion lesson guide. If you'd like extra lessons involving soy, check out the elementary and high school lesson activities. You'll be soy savvy if you pair these with watching the soy science videos on this website. The educational partner below supported the video content for all of us to learn from. Click the link below for bonus learning opportunities and to develop the important skill of gathering information from a variety of sources.

    • Industrial Sand Mining 101
      Jacob lens

      Can you list three things you use every day made from or by using industrial sand? Would you believe your drinking water, your toilet, your smart phone, your car's engine, windshield and probably the gas in the tank are all made from or used industrial sand in some way? No joke. Dig deep into this "gritty" science, both here and in your classroom, to discover how something as simple as ancient sand impacts our lives in so many ways.

    • The Water You Drink
      LilyBottles

      Dive into the video links below to answer these vital questions. Each of the four parts to the video will help you discover how clean water gets delivered to your home. That’s… kind of important, right? If you’re watching the videos in the classroom, be sure to have your teacher download the discussion guide to follow along with the videos. You also won’t want to miss the link to our educational partner’s website. They supported the video content and offer bonus learning opportunities on their website.

    • Ice Caves of Lake Superior
      ArchCave

      The steep sandstone cliffs along Lake Superior have been weathered by wind and waves for millions of years. In some places, this erosional action has formed caves in the rock. When winters become especially cold, ice can fill the caves and create a place begging to be explored. Watch the Serious Science video to discover nature's secrets about these fascinating features. When you see how much fun the ITO adventure team exploring up there and how much they learn, maybe you’ll be inspired to “chill” up there yourself. Be sure to check out the lesson activities below to share in classroom learning about rocks and erosion. Don’t forget your hardhat... with earmuffs.

New Topics

  • OiForms3

    Decoding the Science of Crude Oil Formation

    To decode the science of crude oil formation we first need to go back in time. Waaaay back! We have to set our geologic clocks back tens and even hundreds […]

  • Mad at waste

    Household Hazardous Waste

    There’s lots of serious life lessons to learn here in watching Household Hazardous Waste In Our Environment.  At the bottom of the page, you’ll also find a ton of solid […]

  • boy purs oil in liquid

    Chemistry of Life

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