Philosophical
Bald Man Paradox
How many hairs must you lose to be bald?
Overview
A variant of the Sorites paradox applied to baldness, questioning vague predicates.
A man with a full head of hair is not bald. Removing one hair doesn't make him bald. By induction, he'd never be bald, even with zero hairs. But clearly, someone with no hair is bald. Where's the boundary?