Your brain is active even if you are asleep. As an adult passes into deeper stages of sleep, brain waves begin to slow down and become bigger. As your sleep deepens, the brain activity moves into REM sleep. The muscles then relax and breathing is regulated to help the body recover from the long day.
100 Mind-Blowing Begin Facts
The expiration dates on a bottle of water are not for the water. The expiration date is for the bottle itself. After some time, the plastic will begin to leach into the liquid.
Red blood cells are produced in the bone marrow. The red blood cells begin in the bone marrow as immature cells. After a week of maturing, they are sent out to the bloodstream. The bone marrow also produces 60-70% of white blood cells as well as all of the platelets.
Months that begin on a Sunday will always have a “Friday the 13th”. Friday the 13th may just be another day for you, but some cultures are very wary of this number for its supposed bad luck.
Only one married couple has ever been sent to space. Mark Lee and Jan Davis met during their astronaut training programs but decided to keep their relationship secret. NASA had an informal policy against sending out married couples on missions. Nine months before their mission, they got married, and by the time NASA found out it was too late to begin training replacements. Instead, they made their informal policy formal to prevent it from happening again!
The British pound is the oldest surviving currency in the world, it was once made of sterling silver which is how it got its name ‘pound sterling’, and the Bank of England was the first institution to begin regular issuance of banknotes in 1695.