Carl Sagan points out that the nitrogen in our DNA, calcium in our teeth, iron in our blood, and carbon in our apple pies all formed inside collapsing stars. The conclusion is simple: we are made of starstuff. #CarlSagan
1h
Carl Sagan points out that the nitrogen in our DNA, calcium in our teeth, iron in our blood, and carbon in our apple pies all formed inside collapsing stars. The conclusion is simple: we are made of starstuff. #CarlSagan
1h
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