Photic sneeze syndrome
- From: Rushtown <Rushtown@xxxxxxx>
- Date: 25 Apr 2007 23:42:39 -0700
About 15% of people have a condition where they sometimes sneeze when
bright sunlight suddenly hits there eyes.
The condition is more common in Caucasians.
Why did evolution develop such a trait?
The key is the above mentioned ethnic difference.
In the E of E D (Era of Evolutionary Development) more Caucasians
lived in caves. There being no running hot water the caves got really
smelly
and the caveman's nose filled up with cave stink, thereby rendering
him unable to smell the bear lurking outside the cave when he (the
caveman) first stepped out into the sun.
However those cave people who sneezed when first leaving the cave
cleared their noses (while momentarily startling the bear, who paused
for a moment). With their now cleared nose they were then able to
smell the bear or other threatening animal. This increased the
chances of survival of those with photic sneeze syndrome. There being
more dark caves at northern latitudes Caucasians inherited this trait
in a greater proportion than other races.
.
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