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TIL Trees communicate with each other mainly through the use of underground networks made of fungi that grow around their roots. These networks are called mycorrhizal networks. Mycorrhizal networks connect individual plants (like trees) together into a communication network via their roots.

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X6wj TIL: The term “Bistro” means “quickly” in Russian, and was introduced to the French in Paris during the Russian occupation of France following the Napoleonic Wars, as Russian soldiers overran Parisian restaurants
Eg9mP TIL where the idiom “dead as a doornail” came from. In old times when nails were made by hand, they were often reused and had quite a long life span. Nails used to make doors however, only had a one time use because of how they were used to build a strong door.
0M4y TIL in World War I, Germans used a non-lethal gas that could penetrate American gas masks and cause vomiting. When soldiers removed their masks to vomit, they were exposed to the fatal gasses already in the air.
ne6Gr TIL that a breastfeeding mother can absorb some of the babies saliva through the breast duct. The mothers immune system analyses the saliva and adjusts the antibodies in the breast milk according to the babies needs.
QNK76 TIL that the deepest building in Europe is located in Portugal. It's inside "Quinta da Regaleira", and it's the inverted tower, a building that is 27 meters underground and consists of 9 levels.