Frank Lloyd Wright designed over 1,000 structures — about 500 were built.

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.

Islam has five pillars: faith, prayer five times daily, charitable giving, fasting during Ramadan, and pilgrimage to Mecca.

Arguments about money are among the most common relationship disagreements.

Beethoven's Fifth Symphony opens with one of the most recognizable motifs in classical music — four notes long.

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

The informal economy in developing countries often employs more people than the formal sector.

The Tour de France is one of the most famous cycling races in the world.

Poverty traps occur when poverty itself prevents people from acquiring the resources to escape it.