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TIL penguin poop will change Antartica's ecosystem. For the last 5,000 years, penguins have delivered roughly 16 million pounds of nutrient rich poop on the rocks of Antartica. This poop can one day support plants and animals which currently can't survive in Antartica.

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oROd7 TIL that the Great Wall of China was not built as a single continuous wall, but rather as a series of walls and fortifications constructed by various dynasties over centuries. The most well-known sections were built during the Ming dynasty (1368–1644).
5Y4y8 TIL The main shareholder in the firm that owns the Carrara quarries in Italy is the bin Laden family, which means the marble used in the Freedom Tower is quarried by the family of Osama bin-Laden, who engineered the destruction of the Twin Towers that previously stood on the same site on 9/11.
N7MPN TIL more than 40,000 people apply to visit the extreme haunted house McKamey Manor every year. In two decades, nobody has ever completed the haunt.
D18dv TIL in 1915 the Boy Scouts created a secret society with its own symbols, handshakes, and private rituals. It was eventually named "Order of the Arrow" and was inspired by Native American and Masonic culture. Their society was also influenced by the poem "Hiawatha" and novel "Last of the Mohicans".
M7k98 TIL the first games in the Pokémon series, Red and Blue, contained 150 Pokémon as a reference to Dunbar's number, the number of relationships a single human being can have and properly maintain.