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TIL A key symptom of depression is anhedonia, typically defined as the loss of ability to experience pleasure. It is a core feature of depression, but it is also one of the most treatment-resistant symptoms. Using ketomine, researchers found over-activity in the brain blunting reward seeking

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Eeww TIL in 2001 Robin Williams befriended Koko the Gorilla. When told of his death, she signed the word for “Cry” and continued to be somber the rest of the day.
KVlJ TIL the concept of the “rap battle” has existed since the 5th century, where poets would engage in “flyting,” a spoken word event where poets would insult one another in verse. The Norse god Loki is noted as having insulted other gods in verse.
9YLoM TIL Monobloc plastic chairs are so widely used in the world, because of this, they became 'context-free object' for academic studies.
4XplN TIL Despite being apex predators, orcas do not see humans as prey and they are even docile to them in some circumstances. There are no modern reports of fatalities caused by wild orcas.
NmAE TIL that the southern United States converted all its railroads from broad gauge (5 feet/1.524 meters) to standard gauge (4 feet 8 1⁄2 inches/​1.435 meters) in 36 hours starting on May 31, 1886