'Why We Are Made of Star Stuff' (IMAGE) American Chemical Society Caption As Carl Sagan famously said, 'We are made of star stuff.' It's a mind-boggling thought, but what exactly did he mean? Ahead of Sagan's birthday on Nov. 9, Reactions teamed up with the American Association of Chemistry Teachers and best-selling author Sam Kean to explain the chemistry behind this iconic quote. Watch our latest episode to find out how many of the atoms that make up you (and everything else) were forged in the nuclear cores of stars billions of years ago. Credit The American Chemical Society Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.