The Star In You
Just what do astronomers mean when they say we're all made of star stuff?
Galileo's refractor and Newton's reflector remain the two standard types of optical telescopes today.
How Fuel Cells Work
You need some hydrogen, some oxygen, a special membrane, a couple of catalysts, and presto—you've got power.
Surviving a Supereruption
What could we expect if one of these volcanic megablasts were to occur today?
End of the Big Beasts
Overhunting, climate change, disease, and now a comet. What did kill off the megafauna?
A Potpourri of Pooches
How come dogs, alone among Earth's species, come in so many shapes and sizes?
Bitten By the Bug
What lies behind fossil-bearing amber's fascination? Hear from one newly minted aficionado.