The Olympic Games are held every four years.

Wayne Gretzky scored so many goals in his NHL career that if you remove all his goals, he would still be the all-time leader in points.

Chess grandmaster Magnus Carlsen has been world champion since 2013 and has the highest Elo rating in history.

The oldest known musical instrument is a flute carved from a vulture bone, found in Germany and dated to 40,000 years ago.

The Portuguese word 'saudade' describes a nostalgic longing for something loved and lost — it has no direct English equivalent.

The longest note ever held by a human was over 40 seconds by singer Alpaslan Durmuş.

The labyrinth of Crete, in Greek myth, was designed by Daedalus to contain the Minotaur.

Synchronized skating — where teams of up to 20 skaters perform together — is a competitive discipline not yet in the Olympics.

The international governing body for chess, FIDE, was founded in 1924 and recognizes titles including Grandmaster.