Wearing contact lens dramatically alters the microbiome of the eyeball.
Smooching feels good, of course, but couples first started swapping saliva as a way to test out genetic compatibility.
If your kid's got a cold, it's best to just let the runny nose run its course.
Iron can be used by our body for good or bad, depending on which cells get a hold of it.
A new study suggests it may not be the worst thing in the world to clean your baby's pacifier with your own saliva.
Your body works hard to raise its temperature, but in the meantime, you get the chills. Why?
Why does the body go through such laborious misery when we're sick?
How much damage can one little peanut do? An awful lot for those who are allergic.
Does the amount of sleep I get affect how likely I am to catch a cold?
Depression may have an evolutionary benefit. It may improve one's chances of fighting off infection.