Smooching feels good, of course, but couples first started swapping saliva as a way to test out genetic compatibility.
Here's how to undo the damage caused by tooth decay:
Why do arms sometimes fall asleep and why do they start to tingle?
Do we sneeze during sleep? Find out on this Moment of Science.
Brushing your teeth might do more good than you thought.
Botox is the marketing name given to a neurotoxin called botulinum toxin A. This toxin comes from the bacterium that produces the poisons responsible for causing botulism.