THE UNKNOWN FACTS-4

THE UNKNOWN FACTS-4

     1.    Each eye of a dragonfly has about 30,000

lenses.

    2.    In the US, one third of all adults complain about sleep problems. (I think not only in the US.)

    

    3.  The channel catfish has 100,000 taste buds on the outside of its body.

      4.   The venom of the black widow spider is called "latrotoxin."
 This toxin causes a massive release of acetylcholine from neuromuscular junctions.

    5.   The X-ray was invented by Wilhelm Konrad Roentgen in 1895.

    6.    A giraffe sleeps only two hours each day.

    7.    The human eyeball is 24.5 mm (~ 1 in)

long.

    8.    The adult human spinal cord weighs about

35 grams (0.1 lb)

    9.    The brain of a cat weighs about 30 grams. 

   10.  There are about 3 million miles of axons 

(This is a snake like cable, several times thinner than a human hair and it is where electrical impulses from the neuron travel away to be received by other neurons.) in the human brain.

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