Whatever happened to acid rain? - Joseph Goffman
Adults History Life Nature Environment Science Global WarmingDiscover what causes acid rain, and how scientists were able to largely eliminate this major environmental threat.
New Feature - Release Exercise Answers
Teachers Teacher Cafe EducationExercise answers are now hidden from the students by default. You can release the answers at any time by clicking on this icon.
New Feature - Share Exercises with Multiple Classes
Teachers Teacher Cafe EducationTeachers can now share an exercise with multiple classes at once.
This is why we can't have nice things
Adults Education Life Technology HumorThis video is about stuff: light bulbs, printers, phones and why they aren't better.
What’s the best fuel for your car?
Adults Automotive Nature Science Energy Environment TransportationDig into which fuel— gasoline, electric, biofuels, or electrofuels— is both affordable for consumers and sustainable for the planet.
Why "Nothing" Matters in Science
Adults Data Science Math ScienceNull results often get a bad rap, sometimes characterized as a study "finding nothing," but there's a lot we can learn from studies whose results fail to support their hypotheses.
How much land does it take to power the world?
Adults Industry Technology World Energy EnvironmentExplore the sustainability of fossil fuels, nuclear power, and renewable energy and how much space each of these power sources use.
How much electricity does it take to power the world?
Adults Education Technology World Energy EnvironmentDiscover how much electricity humanity uses, and how clean energy sources could help revolutionize our energy supply in the future.
Illusions of Time
Adults Education Human Psychology Neuroscience ScienceYour brain is a time machine!