18) The
human brain stops growing at the age of 18.
19) Females have 500 more genes than males and
because of this, they are protected from things like color blindness and
hemophilia.
20) The short-term memory capacity for most
people is between five and nine items or digits. This is one reason that
phone numbers were kept to seven digits for so long.
21) If you combined all the muscles in an
average human in to one muscle, the force it would be capable of producing
is about 2000 tones.
22) Human thigh bones are stronger than
concrete.
23) The lens of the eye continues to grow
throughout a person's life.
24) It only takes 7 Ibs of pressure to rib off
your ears.
25) One year, Elvis Presley paid 91 % of his
annual income to the IRS.
26) A new born baby breathes five times faster
than an adult man.
27) Ostriches can run faster than horses, and
the males can roar like lions.
28) Sloth's take two weeks to digest their
food.
29) Guinea pigs and rabbits can't sweat.
30) Sharks and rays are the only animals known
to man that don't get cancer. Scientists believe this has something to do
with the fact that they don't have bones, but cartilage.
31) The porpoise is second to man as the most
intelligent animal on the planet.
32) Deer can't eat hay.
33) The lifespan of a squirrel is about nine
years.
34) There are more than fifty different kinds
of kangaroos.