There’s a reason the game Asteroids was so panic-inducing—giant space rocks hurtling toward Earth at 45 times the speed of a bullet are no small threat. When one of these celestial missiles strikes, the consequences can be nothing short of catastrophic. Some 66 million years ago, a massive asteroid collided with our planet. No fossils have ever been found above the impact layer, marking a clear divide in Earth’s history. The gigantic crater left behind remained hidden to science until the 1990s,

1.3M views · 9.1K reactions | Over the 1,500 years of its existence, chess has been known as a military strategy tool, a metaphor for human affairs and a measure of genius. Where did this beloved game come from? | TED-Ed | Facebook