I thought of some ideas...
1) How are tears formed?
2) Why do humans cough?
3) Why do people get dizzy after getting up?
4) Why do people close their eyes when sneezing?
5) When your throat is itching scratch the back part of your ear...
6) Why does the right ear has a better hearing than the left ear to the fast tempoed conversation?
7) Sexual imagination can delay men's urinary signal
... that's about it for now
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