Flu shots only work about 70% of the time.
18
The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
15
The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
21
Every year your body replaces 98% of your atoms.
119
Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
103
When you look up at the blue sky and see white dots flying around, you’re actually seeing your own white blood cells.
30
After an 11 year study, cell phones were shown not to increase chances of getting cancer.
14
Every time you sneeze some of your brain cells die.
113