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TIL that the smell of rain is called “petrichor” and is caused by oils released by plants during dry periods then absorbed by clay and soil. Humidity then releases these oils into the air

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7rGdL TIL apes never ask questions. Apes are able to learn sign language and even communicate using it, apes have never attempted to learn new knowledge by asking humans or other apes. Apes can't realize that others can know things they don't. It's a concept that separates humans from apes.
yZM TIL There is an island in the South Pacific that is entirely uninhabited. 47.23 km² (18.24 sq mi) Pagan island.
6EaEW TIL Tremont Street subway in Boston is the oldest underground rail in North America. Third oldest in the world after London and Budapest.
697EZ TIL When humans take a breath, they replace only 15% of the air in their lungs with fresh air. When dolphins take a breath, they replace 90% of the air in their lungs with fresh air
epW1g TIL There is a deep-sea fish which has a transparent head with eyes pointing upwards to see prey. It was discovered and described in 1939