What brings on itches in the first place, and why does scratching provide such welcome relief?
Fingernails. They're good for scratching, biting, clipping, and polishing. But what are they, in fact?
Chow down salty chips or pretzels, and soon you'll be guzzling your favorite drink. But snacking on sugary foods makes you thirsty, too.
The body must produce the liquid part of blood, called plasma, and the cells that float in it.
Cell copies are not perfect--the chromosome isn't copied all the way to the tip. That's where telomeres come in handy.
Scientists used to think that for all its complexity, the brain was pretty static. But... is this true today?
Although painted turtles don't have much else in common with automobiles, their wintertime coping strategies include antifreeze, too.
Were the eggs we buy in the supermarket once embryos?
How does the vine know to twine, and in what direction?
New strains of antibiotic-resistant bacteria are appearing faster than scientists can discover new antibiotics.