Riding on the subway earlier today, a guy got on an starting preaching how "the lord saves" and "you must embrace Jesus." I wish math could create equivalent e

Riding on the subway earlier today, a guy got on an starting preaching how "the lord saves" and "you must embrace Jesus." I wish math could create equivalent evangelism. I'd love to live in a world where a guy gets on the subway and starts preaching the Pythagorean theorem?