Why Is It?
Email Spam
Email spammers use disorienting techniques to get you to click on their links.
Dino Chicken
Scientists switch off genes in chickens to learn about dinosaurs.
Space Elevator
Could a “space elevator” carry supplies to the International Space Station?
Why Are Plants Green?
The dominance of green chlorophyll on Earth may have come after a more purple period.
Baby Tooth Cavities
Baby teeth fall out eventually. But that doesn't mean cavities in baby teeth should be ignored.
Nesting Dogs
A listener asks why dogs sometimes turn around in circles before lying down.
Knuckle Cracking
Cracking your knuckles sets off a tiny “firework explosion” in the joint.
Fast-Aging Fish
Can super fast-paced fish reveal how humans could live longer?