SALMAN KHAN: Hi, my name is Sal Khan. I'm the founder and faculty of the Khan Academy, and we're trying to educate the world. Welcome to the presentation on basic addition. In August...
Why is the sky dark at night? You might think the answer is obvious - the sun isn't up! But the only reason the sky looks blue during the day is that sunlight scatters off of the atmosphere -...
I`m not very good at singing songs but here's a try If you wish to make an apple pie from scratch You must first invent the universe Space is filled with a network of wormholes You might...
We are all connected; 私達は全てつながっている。 To each other, biologically お互いに、生物学的に To the earth, chemically 地球に、化学的に To the rest of the universe atomically 残りの宇宙には原子的に。 I think nature's imagination...
[Neil deGrasse Tyson] We are part of this universe We are in this universe The universe is in us Yes, the universe is in us We are part of this universe We are in this universe The universe itself...
Let's be honest: a lot of us sit inside...all day. Whether it's for work or to binge on the newest TV series, we simply aren't outside very often. But, what would happen if you...
You may have heard that Einstein's theory of special relativity imposes a cosmic speed limit: nothing can travel faster than the speed of light. Well, that's wrong. All that Einstein...
this is a story about a world obsessed with stuff it's a story about a system in crisis. we're trashing the planet we're trashing each other and we're not even having...
[Professor Alice Roberts] How do you start to get close to animals that lived hundreds of millions of years ago? Dinosaurs (Di-no-saurs - D-di-no-saurs - D-d-di-no-saurs) [Dallas Campbell] Dinosaurs...