Your fingernails grow faster in summer.
744
Tigers can see 6 times better at night than humans.
305
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
There are about 255 babies born worldwide every minute.
46
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127