Compact Fluorescent Lightbulbs
The amount of mercury in a CFL bulb does not pose much of an environmental hazard.
Why Is It?
Hungry Mosquitoes
Mosquitoes find their prey by following plumes of carbon dioxide.
Upside-Down Airplanes
The shape of the wing is what allows a plane to fly upside down.
Polar Bear Hibernation
Polar bears don't hibernate the way that other bears do.
Global Warming
A listener asks: If it's so cold outside this winter, how can we be experiencing global warming?
Mountain High
Have you ever been to a high altitude and found yourself gasping for breath? One listener asked why …
Space Ship Gravity
Spinning spaceships could create artificial gravity in principle but not in practice.