Category Health

Sleep: Facts About How and Why We Sleep

It is estimated that we spend about one-third of our lives in the dream world. Find out more about the science of sleep. (Image credit: CSA Images via Getty Images) Jump to: Sourse: www.livescience.com Your email address will not be…

How long can human sperm survive?

Days, months, years: How long can human sperm last? (Image credit: LYagovy via Getty Images) Sperm have a big job to do, but their time is limited. From the moment they are formed in the testicles until they can navigate…

Does time “move slower” when you exercise?

In scientific studies, people often notice that time seems to pass more slowly during exercise than when they are at rest. Why does this happen? (Image credit: Mint Images via Getty Images) Time may fly when you’re having fun, but…