The American Chemical Society's latest Reactions video delves deeper into Carl Sagan's assertion that "We are made of star stuff."
Most people with a science background know that Sagan wasn't waxing poetic with the star stuff. We really are made of the same things. This short video explains where elements come from and how scientists in the 1950s surmised that "the universe was once a sea of hydrogen with a smattering of helium and lithium."
Check it out for yourself.