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.
Surviving a Supereruption
What could we expect if one of these volcanic megablasts were to occur today?
How Fuel Cells Work
You need some hydrogen, some oxygen, a special membrane, a couple of catalysts, and presto—you've got power.
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?
Forecasting Volcanic Eruptions
How good are we at predicting when an active volcano will next blow its top?