The four most common chemically active elements in the universe - hydrogen, oxygen, carbon, and nitrogen - are the four most common elements of life on Earth. We are not simply in the universe. The universe is in us.
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If you have suggestions for topics to cover here, please feel free to send me your ideas!
I'll post a note on the What's New page whenever updates are made here, so if you sign up for our
Email Notifications of the What's New page, you'll get an email every time I add something.
