math_fact: 2391 is the number of ways to flip a coin 12 times and get at least 3 heads in a row.
trivia: 2391 is a boring number.
historical_date: July 18th is the day in 1857 that Louis Faidherbe, French governor of Senegal, arrives to relieve French forces at Kayes, effectively ending El Hajj Umar Tall's war against the French.