ABOUT HUMAN BODY
---GOOSE BUMPS EVOLVED TO MAKE OUR ANCESTORS HAIR STAND UP .,MAKING THEM APPEAR MORE THREATENING TO PREDATORS .
IF THEY WERE LAID END TO END ,ALL OF THE BLOODVESSELS IN THE HUMAN BODY WOULD ENCIRCLE THE EARTH FOUR TIMES .
AS YOU BREATHE ,MOST OF THE AIR IS GOING IN AND OUT OF ONE NOSTRIL .EVERY FEW HOURS,THE WORKLOAD SHIFTS TO THE OTHER NOSTRIL .
BLOOD MAKES UP ABOUT 8 PERCENT OF YOUR TOTAL BODY WEIGHT .
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YOU HAVE TWO KIDNEYS ,BUT ONLY ONE IS NECESSARY TO LIVE .
BELLY BUTTONS GROW SPECIAL HAIRS TO CATCH LINT .
THE SATISFYING SOUND OF CRACKING YOUR KNUEKLES COMES FROM GAS BUBBLES BURSTING INYOUR JOINTS.
SKIN IS THE BODY'SLARGEST ORGAN AND CAN COMPRISE 15 PERCENT OF A PERSON ' S TOTAL WEIGHT.
THUMBS HAVE THEIR OWN PULSE. YOUR TONGUE IS MADE UP OF EIGHT INTERWOVEN MUSCLES, SIMILAR IN STRUCTURE TO AN ELEPHANT'S TRUNK OR AN OCTOPUS' S TENTACLE.
ON A GENETIC LEVEL, ALL HUMAN BEINGS ARE MORE THAN 99 PERCENT IDENTICAL.
THE FOOT IS ONE OF THE MOST TICKLISH PARTS OF THE BODY.
A SURGICAL PROCEDURE CALLED A SELECTIVE AMYGDALOOHIPOCAM REMOVES HALF OF THE BRAIN'S AMYGDALA.
