Dark matter: The matter we can’t see – By James Gillies

https://ed.ted.com/lessons/dark-matter-the-matter-we-can-t-see-james-gillies

It’s uncanny that the theory that all matter is made of atoms is 2,500 years old (Leucippus of Miletus and his student Democritus of Abdera in the 5th century BCE). Physicists say that 95% of the universe is dark matter and dark energy. That’s spooky!

This lesson is quite similar to another lesson on Dark Matter. I guess it really matters.