Paul Andersen explains how natural selection is a major mechanism in evolution. The video begins with a discussion of Charles Darwin and the details of natural selection. The data of the peppered moth during the industrial revolution...

View full lessonf='https://ed.ted.com/lessons/the-hidden-network-that-makes-the-internet-possible-sajan-saini' target='_blank' rel='nofollow'>lesson↵↵In 2012, a team of researchers set a world record, transmitting 1 petabit of data—...

How does light speed up after leaving glass or water? What do light and the President of the United States have in common?

Is Glass a Liquid?

What wiped out the dinosaurs? Most of us were taught it was a killer asteroid—which is true. But it turns out there was more than one disaster movie playing at the cineplex that was Earth 66 million years ago.

Light is everywhere … but it’s not as predictable as you might think. It’s a wave that travels in straight lines, yet it also reflects off of surfaces, refracts through various materials, and generally changes direction all the time!...

So, we know what materials are, but can we make new materials? Or improve the materials we already have? In this episode of Crash Course Kids, Sabrina shows us how Material Scientists are working on these two things today. Also, your...

Splinters are gross, but you might want to watch this before grabbing the tweezers.

The water in your faucet may once have been part of a cloud...or a snowflake...or even the ocean! And it’s all because of the water cycle!

In this video Paul Andersen explains how the resistivity of a material opposes the flow of charge. Conductors (like metal) will have a low resistivity and insulators will have a high resistivity. Semiconductors will have a moderate...

Hey... what's matter? No no no, not what's THE matter. What's MATTER? In this episode of Crash Course Kids, Sabrina talks about what matter is and the three states of matter: Solid, Liquid, and Gas. She also does a quick experiment that...

Explore the physics of why the water level in a glass remains the same as ice melts.

Things Other Countries Do Totally Differently!

In Part 2 of a discussion on the Hypothesis, Dr. Boyd walks you through 2 additional control experiments that can be used to confirm our conclusions from Part 1.

After properly documenting evidence, it's time to collect it for further analysis. How is this done? There is very strict protocol for keeping all evidence separate, and properly recording precisely where it came from, so let's get some...

Foods That Can Cause Sleep Problems

There’s no shortage of watering holes in Tokyo, but there’s only one fairy-themed bar with drinks as magical as the décor.  Author Ashley Sutton based his bar concept on a series of fantasy books of the same name.  A transplant from...

Foods That Can Cause Sleep Problems

Howcast - Forget the smoothies, granitas, cool lattes, and other frozen imitators—there’s nothing that satisfies your sweet tooth like a good old-fashioned milkshake.

Howcast - Personalize your drinking glasses by etching names and messages on them. Your guests will be so impressed!

Howcast - There’s nothing like a glass of ice cold lemonade on a hot day.

Howcast - The trick to ordering a drink in a crowded bar? Make it as easy on the bartender as possible.

Howcast - While we can't recommend asparagus or cheddar-flavored drinks, we encourage you to experiment, using this road map to the ultimate healthy blended beverage.

Howcast - You don’t have to watch a single nominated movie to win an Oscar pool – just use these strategies.