Rest in Peace, Alexander Bogomolny @CutTheKnotMath
He was of the few saints you meet in life: He gave more, much more than he took.
— Nassim Nicholas Taleb (@nntaleb) July 8, 2018
Alexander Bogomolny was a mathematician and educator well known for his website Cut the Knot, which offered interactive mathematical miscellany and puzzles. You can learn more about him, education and antisemitism in the USSR, his mathematics research and his approach to Cut the Knot in this interview from 2014.