Seinfeld went off the air decades ago, but the classic sitcom still makes us laugh. Here are the 15 best Seinfeld characters, ...

Regina G. Barber is a co-host of Short Wave, NPR's science podcast. Barber completed her PhD in physics at Washington State University with a focus in astrophysics, studying globular cluster systems.

Typically, the giant cacti sprout flowers only around the tips of their arms and trunks, but this year a large number of them are also pushing out buds farther down their stems. Research ecologist ...