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On Being Dense image

On Being Dense

This is the third of twelve lectures by Neal deGrasse Tyson.

In a follow up to a lecture covering that which is rarefied in the cosmos, Neil continues on to lecture about that which is dense.  More generally, a discussion about what it means for things to have density at all.


Why Are We Here? image

Why Are We Here?

Everything you thought you knew about the universe is wrong. It's made of atoms, right? Wrong. Atoms only account for a measly 15% of everything that exists. The mass of the universe consists of something so mysterious and elusive that it has been dubbed dark.

The Evidence image

The Evidence

If ancient aliens visited Earth, what was their legacy, and did they leave behind clues that exist in plain sight such as sophisticated aircraft, complex electrical grids, and intricate construction machinery? Indian Sanskrit texts, dating back to 6000 B.C., describe in varying but vivid detail flying machines called Vimanas. Megalithic stone structures in Egypt reveal evidence of precision saw work. Interpretations of the Jewish Zohar writings offer depictions of a life-sustaining manna machine, eerily similar to chlorella algae processing systems today. Are these examples of modern technology, or is there evidence that these incredible mechanisms existed on Earth thousands of years ago?


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