Question: what are the unsolved math problems?
Answer: The Collatz Conjecture. Dave Linkletter. ...  Goldbach's Conjecture﻿ Creative Commons. ...  The Twin Prime Conjecture. Wolfram Alpha. ...  The Riemann Hypothesis. ...  The Birch and Swinnerton-Dyer Conjecture. ...  The Kissing Number Problem. ...  The Unknotting Problem. ...  The Large Cardinal Project.