What Is Life? Is Death Real?

What Is Life? Is Death Real?

Life is fundamentally different from dead stuff—or is it? Physicist Erwin Schrödinger defined life this way: Living things avoid decay into disorder and equilibrium. What does this mean? Let’s pretend that your download folder is the universe. It started orderly and got more and more...

Light Pollution 101 | National Geographic

Light Pollution 101 | National Geographic

– [Narrator] The invention of the electric light bulb, 150 years ago, was one of the most transformative milestones in history. This new form of light, artificial light, brightened and made safe once-dark streets, prolonged waking hours into the evening, and brought electricity into homes...

How An Igloo Keeps You Warm

How An Igloo Keeps You Warm

[MUSIC] For thousands of years, humans, and plants and animals long before that, have been using frozen “sky water” to keep warm. Which sort of doesn’t make sense. Because snow is cool. You might even say it’s… ice cold. YEEAAHHHHH! No one knows for sure...