Six questions about the atoms in your fingers, an animal that shrugged off the vacuum of space, and why a hot piece of metal can be more dangerous to a spacecraft than a cold one.
Your first question:
You’ve probably heard the phrase “we are made of stardust.” It turns out that’s not poetry — it’s chemistry. Almost every atom in your body was forged inside a star. There’s exactly one major exception. Which element in you did NOT come from a star?
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