Is the underhand serve a legitimate tactic in tennis? First introduced by Michael Chang in the 1989 French Open, this shot is still controversial today. Find out why in this video.

Does daylight savings really make sense? According to this report, it is becoming harder to justify its existence, prompting some countries to drop the idea altogether.

Find out how Pope Leo XIV was chosen after a complicated process. This video explains in great detail how the college of cardinals gather for a conclave in the Vatican to elect the pope.