Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
The human eye blinks an average of 4,200,000 times a year.
233
Ice isn't slippery. What makes people and things slip on ice is water. A thin layer of ice melts when pressure is applied to it and it is this wet layer on top of the ice that is slippery.
153
Sunflowers can be used to clean up radioactive waste.
17
Passengers on the Beijing subway can pay with plastic bottles.
29
Speed dating was invented by a Rabbi in 1999.
45
85% of all Valentine's Day cards are purchased by women!
38
"Big Ben" in London isn't a tower, the bell inside the tower is called "Big Ben", the tower itself is called "The Elizabeth Tower".
18