Brain Teasers
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An island gets exactly 100 visitors every day. Each visitor stays for exactly one full day, then leaves. After the island has been open for a year, how many visitors are on the island on any given day?
Research Clues
About einstein brain teasers
These are problems that trip up people who are good at math. Infinite series that converge to unexpected values. Game theory scenarios where the "rational" strategy seems irrational. Paradoxes where both sides of an argument look correct until you find the hidden assumption.
Read the proof even if you got the answer right. Einstein-level problems often have multiple valid approaches, and the proof might show a cleaner one than whatever you cobbled together. If you're consistently solving these, you're in rare company.