TED-Ed
TED-Ed: Nature's fortress: How cacti keep water in and predators out | Lucas C. Majure
If you were a jackrabbit in the desert, you'd be glad to stumble across a cactus: the flesh of these plants is a water source for many animals. Known for their spines and succulent stems, cacti of all shapes and sizes have evolved to not...
TED-Ed
What few people know about the program that "saved" America | Meg Jacobs
In 1932, one in four Americans was unemployed, marking the highest unemployment rate in the country's history. The Democratic presidential candidate Franklin D. Roosevelt promised a New Deal— a comprehensive set of legislation to support...
Crash Course
Communists, Nationalists, and China's Revolutions Crash Course World History
In which John Green teaches you about China's Revolutions. While the rest of the world was off having a couple of World Wars, China was busily uprooting the dynastic system that had ruled there for millennia. Most revolutions have some...
TED-Ed
How do you know what's true? | Sheila Marie Orfano
A samurai is found dead in a quiet bamboo grove. One by one, the crime's only known witnesses recount their version of the events. But as they each tell their tale, it becomes clear that every testimony is plausible yet different. And...
Crash Course
Indus Valley Civilization Crash Course World History
In which John Green teaches you about the Indus Valley Civilization, one of the largest of the ancient civilizations. John teaches you the who, how, when, where and why of the Indus Valley Civilization, and dispenses advice on how to be...
Amoeba Sisters
Fermentation
What happens when you can't do aerobic cellular respiration because oxygen isn't available? Explore fermentation with The Amoeba Sisters! This video focuses on alcoholic fermentation and lactic acid fermentation, and it also mentions how...
TED-Ed
TED-Ed: How puberty changes your brain | Shannon Odell
While we often talk about puberty's effect on the body, what gets overlooked are the fascinating changes that happen in the brain. Puberty, in fact, begins in the brain, and lasts as long as five years. And during this extended process,...
Crash Course
The New Deal Crash Course US History
In which John Green teaches you about the New Deal, which was president Franklin D. Roosevelt's plan to pull the united States out of the Great Depression of the 1930's. Did it work? Maybe. John will teach you about some of the most...
Amoeba Sisters
Enzymes (Updated)
The Amoeba Sisters explain enzymes and how they interact with their substrates. Vocabulary covered includes active site, induced fit, coenzyme, and cofactor. Also the importance of ideal pH and temperatures for enzymes are discussed.
TED-Ed
TED-Ed: How one scientist took on the chemical industry
In 1958, after receiving a letter describing the deaths of songbirds due to the pesticide known as DDT, Rachel Carson began an investigation into the misuse of chemicals and their toll on nature. In 1962, she published her findings in...
TED-Ed
TED-Ed: Will there be another pandemic in your lifetime? | TED-Ed
We tend to think of pandemics as unlikely events, but disease outbreaks are surprisingly common. Over the past 400 years, the longest stretch of time without a documented outbreak was just four years. So, what's the probability of...
TED-Ed
TED-Ed: Can you solve the cheating royal riddle? | Dan Katz
You're the chief advisor to an eccentric king who needs to declare his successor. He wants his heir to be good at arithmetic, lucky, and above all else, honest. So he's devised a competition to test his children, and ordered you to...
TED-Ed
TED-Ed: Which type of milk is best for you? | Jonathan J. O'Sullivan and Grace E. Cunningham
If you go to the store in search of milk, there are a dizzying number of products to choose from. There's dairy milk, but also plant-based products such as almond, soy, and oat milks. So which milk is actually best for you? And which...
TED-Ed
TED-Ed: Can you outsmart this logical fallacy? | Alex Gendler
Meet Lucy. She was a math major in college, and aced all her courses in probability and statistics. Which do you think is more likely: that Lucy is a portrait artist, or that Lucy is a portrait artist who also plays poker? How do we know...
SciShow Kids
How Animals Find Their Way Home!
Jessi and Squeaks are back from their research trip and ready to keep learning with all of you! And on their trip back to The Fort, Jessi thought up a really interesting questions: how do animals find their way home?
TED-Ed
TED-Ed: Can you solve the Alice in Wonderland riddle? | Alex Gendler
After many adventures in Wonderland, Alice has once again found herself in the court of the temperamental Queen of Hearts. She's about to pass through the garden undetected, when she overhears the king and queen arguing that 64 is the...
TED-Ed
TED-Ed: Daniel Finkel: Can you solve the unstoppable blob riddle?
A shooting star crashes onto Earth and a hideous blob emerges. It creeps and leaps, it glides and slides. It's also unstoppable: no matter what you throw at it, it just re-grows and continues its rampage. The only way to save the planet...
TED-Ed
TED-Ed: How friendship affects your brain | Shannon Odell
If it seems like friendships formed in adolescence are particularly special, that's because they are. Childhood, adolescent, and adult friendships all manifest differently in part because the brain works in different ways at those stages...
Amoeba Sisters
Homeostasis and Negative/Positive Feedback
Explore homeostasis with the Amoeba Sisters and learn how homeostasis relates to feedback in the human body. This video gives examples of negative feedback (temperature and blood glucose regulation) and positive feedback (events in...
Crash Course
The Agricultural Revolution Crash Course World History
In which John Green investigates the dawn of human civilization. John looks into how people gave up hunting and gathering to become agriculturalists, and how that change has influenced the world we live in today. Also, there are some...
Crash Course
The Crusades - Pilgrimage or Holy War Crash Course World History
In which John Green teaches you about the Crusades embarked upon by European Christians in the 12th and 13th centuries. Our traditional perception of the Crusades as European Colonization thinly veiled in religion isn't quite right. John...
Amoeba Sisters
Genetic Drift
Discover what happens when random events meet allele frequencies: genetic drift! This Amoeba Sisters video also discusses the bottleneck and founder effect as well as contrasts genetic drift with natural selection. Table of Contents:...
TED-Ed
TED-Ed: The dark history of the suburbs | Kevin Ehrman-Solberg and Kirsten Delegard
Beginning in the 1800s, people began writing clauses into property deeds that were meant to prevent all future owners from selling or leasing to certain racial groups, especially Black people. These racial covenants spread like wildfire...
TED-Ed
TED-Ed: What makes volcanoes erupt? | Steven Anderson
In February of 1942, Mexican farmer Dionisio Pulido thought he heard thunder coming from his cornfield. However, the sound wasn't coming from the sky. The source was a large, smoking crack emitting gas and ejecting rocks, and would come...