A student mistakenly solved an impossible math problem.
In 1939, George Bernard Dantzig arrived late to a statistics class at the University of California and found two math problems on the board. Mistakenly thinking they were his homework, he wrote them down. Of course, he didn’t know at the time that the problems were statistical theorems that hadn’t been proven yet. He took his “homework” home and worked out the proofs for the theorems.
The Earth is called Telleus and/or Terra after both greek and roman gods.