While smoking remains the leading risk factor, other contributors include secondhand smoke, air pollution, radon exposure and ...

Speed in space gets confusing fast. We throw around terms like kilometers per second, fractions of the speed of light, Lorentz factors, and superluminal motion, and before long, everything sounds like ...

In January, a family in Darlington, England, couldn't believe their eyes when they saw what was waiting for them in their garden. The family doesn't own a dog, yet they were certain they could see a ...