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Clearing false health rumors

Ever hear some of those summer rules? Going in and out of the a/c can cause a cold? And don't swim right after you eat? Are these rules based on real science or are just myths?
Wait to go into the pool after you eat.  Don't swallow seeds from watermelons.   All good summer health tips.  Or are they? Doctors say most of them are myths.  So let's break down some of the more popular ones and see if science agrees.
You can catch poison ivy from someone else. 
FALSE.  You get poison ivy from the oil of the plant.
Now if the oil from the plant gets onto tools, or gloves or clothes or even a pet, it's possible you can pick it up from there.
Eating watermelon seeds can make you sick.
NOPE. The idea they can sprout within the body and otherwise cause a problem is completely a myth.
Tanning one time in a tanning bed can protect from the sun's damaging rays. 
Tanning doesn't protect you against developing skin cancer.  Tanning doesn't protect the skin particularly well from the sun's rays. 
You should wait 30 minutes after you eat to go back into the pool
Ah...this one depends.
The digestive process requires blood flow to the stomach and if you distract your stomach by exercising and leading the blood flow to the muscles instead of the stomach you might get some stomach cramp.
- And going in and out of air conditioning can cause you to catch cold
Cold air indoors in the summer does not cause cold. But viruses cause colds.
Best advice for safe summer?  Doctors say use common sense.