All across the world people need to get from one place to another. And sometimes to get to that other place we need bridges. Here are eight bridges that are extraordinary in their own way, from standing the test of time to handling...

Our ability to mine great amounts of energy from uranium nuclei has led some to bill nuclear power as a plentiful, utopian source of electricity. But rather than dominate the global electricity market, nuclear power has declined from a...

FYI: We try to leave jargon out of our videos, but if you want to learn more about this topic, here are some handy keywords to get your googling started:

- Disgust: A feeling of revulsion at something unple
asant
- Emotion:...

Stretched across a tree-peppered expanse in Southern Africa lies the ruins of Great Zimbabwe, a medieval stone city of astounding wealth. Located in the present-day country of Zimbabwe, it's the site of the second largest settlement...

Three Simple Ways to Time Travel

Choosing to marry and share your life with someone is one of the most important decisions you can make in life. But with divorce rates approaching fifty percent in some parts of the world, it's clear we could use some help picking a...

Water can dissolve more substances than anything else on earth...so why doesn't it dissolve everything away?

How can we fix water shortages? Well, we know that shortages are a problem and can cause fighting because water is a resource. When you limit a resource, things get scary. But, in this episode of Crash Course Kids, Sabrina talks about...

Robert Wright uses evolutionary biology and game theory to explain why we appreciate the Golden Rule ("Do unto others..."), why we sometimes ignore it and why there’s hope that, in the near future, we might all have the compassion to...

David Hanson's robot faces look and act like yours: They recognize and respond to emotion, and make expressions of their own. Here, an "emotional" live demo of the Einstein robot offers a peek at a future where robots truly mimic humans.

David Lang is a maker who taught himself to become an amateur oceanographer -- or, he taught a robot to be one for him. In a charming talk Lang, a TED Fellow, shows how he and a network of ocean lovers teamed up to build open-sourced,...

Humans have an almost insatiable energy demand, so scientists and engineers are always on the lookout for sustainable ways to provide the energy we need. And some of these ideas go way beyond solar panels and wind...

Want to learn how to make a super secret hide-out? Jessi shows you how a bedsheet, some books -- and a little bit of science -- can be used to make an awesome fort!

In this video Paul Andersen describes the major parts of an atom and explains how the Bohr Model more accurately represents the location of electrons around the nucleus. Niels Bohr refined the Rutherford model to account for spectra.

So maybe we can't outrun cheetahs or antelope, but humans are uniquely adapted for long distance running. What does science have to say about marathon running? To find out, (and because I was feeling a little crazy) I decided to run one!...

In which John Green teaches you about the Mughal Empire, which ruled large swaths of the Indian Sub-Continent from 1526 to (technically) 1857. While John teaches you about this long-lived Muslim empire, he'll also look at the idea of...

From launching probes to ferrying experiment racks to the ISS, the Space Shuttle Atlantis has left quite the legacy on space exploration and scientific research.

The Renaissance came to England late, thanks to a Hundred Years War that ran long and lasted 116 years, and then a civil war to decide who would be the royal family. BUT after all that, with the Tudors (relatively) securely installed on...

Along the Nile River, in what is now northern Sudan, lay the ancient civilization of Kush. Though they were once conquered by a powerful neighbor, the kings and queens of Kush would go on to successfully challenge two of the most...

In which John covers the long, long history of ancient Egypt, including the Old, Middle and New Kingdoms, and even a couple of intermediate periods. Learn about mummies, pharaohs, pyramids and the Nile with John Green.

For the last 12 years, Carter Emmart has been coordinating the efforts of scientists, artists and programmers to build a complete 3D visualization of our known universe. He demos this stunning tour and explains how it's being shared with...

A SciShow Kids viewer wrote us to ask how bridges are strong enough to carry cars and trucks! Jessi and Squeaks can explain -- with blocks!

It was the western hemisphere's largest empire ever, with a population of nearly 10 million subjects. Yet within 100 years of its rise in the fifteenth century, the Inca Empire would be no more. What happened? Gordon McEwan details the...

Meet some real-life robots, and find out what robots really are, and what they do for us every day!