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…