math_fact: 1941 is the maximum number of regions a circle can be cut into by joining 15 points on the circumference with straight lines.
trivia: 1941 is an uninteresting number.
historical_date: April 24th is the day in 1918 that First tank-to-tank combat, at Villers-Bretonneux, France, when three British Mark IVs met three German A7Vs.