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TIL Giovanni Battista Grassi ingested roundworm eggs in 1879 to solve the century-old puzzle of how infection of roundworm is transmitted from host to host. Eventually, he found fresh eggs in his feces. Thus proving that the roundworm is transmitted through direct ingestion of a contaminated source.

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JVOj TIL the Walt Disney company owned an island near Orlando that opened a theme park in 1974 called Treasure Island. The park was later renamed Discovery Island and mysteriously closed in 1999 without any explanation given.
p8RY4 TIL a Scottish man fasted for 382 days, living on vitamin supplements and non-caloric beverages. He was morbidly obese, weighing 456 pounds, and lost 276 pounds. The fast was monitored by doctors, who detected no ill-effects. He never regained the weight. It was the longest recorded fast in history.
neaaG TIL that before the adoption of artificial light in the 18th and 19th centuries, there's historical evidence for "first sleep" and "second sleep"—that is, an interrupted pattern of sleep in two shifts of slumber roughly four hours each, with a period of wakefulness in between.
9wQnr TIL: People with blue eyes have a higher rate of alcoholism than people with dark eyes
j6AJp TIL that the DSV Limiting Factor, a submarine that is used to dive into the deepest point of Earth, is owned by Valve's (makers of Steam, a PC gaming storefront) Gabe Newell.