Cows can sleep standing up, but they can only dream lying down.
745
Your spit has a painkiller 6 times stronger than morphine. It contains a substance called opiorphin that is stronger than morphine.
39
Sound doesn't travel in space.
255
Yawns are more contagious among people with closer relationships.
163
It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
165
A domestic cat can sprint at about 31 miles per hour.
274
The gas that gives rotten eggs their distinctive foul smell may slow ageing and block damaging chemical reactions inside cells, according to scientists in China.
5
A human brain produces as many as 12,000 to 50,000 thoughts per day, depending on how deep a thinker a person is.
23