National Mathematics Day is marked on December 22, the birthday of Srinivasa Ramanujan, whose work still amazes the world.

Brock Purdy threw a career-high five touchdown passes and Dee Winters returned an interception 74 yards for a score to lead the San Francisco 49ers to a 48-27 victory at Indianapolis.

John Summa is the founder of OptionsNerd.com and has authored a number of books. He has 6+ years as a chief economist and derivatives strategist. Timothy Li is a consultant, accountant, and finance ...