Sumo wrestlers follow a strict lifestyle governed by the Sumo Association, including how they eat, dress, and live.

P vs NP is one of the greatest unsolved problems in mathematics — no one has proved whether hard problems have shortcuts.

The 1883 eruption of Krakatoa created global atmospheric effects.

MSG (monosodium glutamate) is naturally found in tomatoes, aged cheese, and soy sauce — and has no proven link to adverse reactions in controlled studies.

Pineapple contains bromelain, an enzyme that breaks down proteins — it will literally digest your mouth if you eat too much.

The refrigerator allowed long-term food storage.

The Great Lakes contain about 20% of the world's surface freshwater.

The Great London Beer Flood of 1814 released thousands of gallons of beer into the streets.

Kimchi, made from fermented vegetables and chili, has been a Korean staple for over 2,000 years.