Guys, Which of these topics is the most complicated for the average American?

Quantum physics
Deoxyribonucleic acid
Why hot water freezes faster than cold water
Why when you drop a slice of bread with peanut butter on it, the peanut butter side lands on the floor.
Why a turnip can be the president
The difference between legal and illegal immigration
Select gender and age to cast your vote:
Guys, Which of these topics is the most complicated for the average American?
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