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TIL there is such a thing as one-way bulletproof glass. This allows you to return fire through the glass while still keeping you protected from the attacker (your shot leaves a bullet-sized hole, but doesn’t compromise the rest of the shield).

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Ya5P TIL that hundreds of prisoners were left to die in their cells during Hurricane Katrina as officials abandoned the prison.
A8vB TIL Arctos is the Greek word for bear, meaning the Grizzly Bear’s scientific name (Ursus arctos) literally translates as “Bear Bear”, the Arctic Ocean is the “Bear Ocean”, and Antarctica is “The Land with no Bears”.
Ypbkr TIL that the Karen are an actual ethnic group of approximately 7.5 million Sino-Tibetan peoples. While the group as a whole is heterogeneous and disparate, some of the Karen, led primarily by the Karen National Union (KNU), have been in a constant state of war since the 1940s.
p8g9Q TIL that the town of Palisade, Nevada staged gunfights, bank robberies, and Native American raids during the 1870's to attract tourists as the Transcontinental Railroad was built. The truth was known only by the town, and in reality, the town did not even have a sheriff due to its low crime rate.
AD86w TIL Princeton's Roger Nelson PhD proposes that human consciousness affects the variance in randomness of hardware-based random number generators. Since 1998, Nelson's Global Consciousness Project uses a global network to create random data over time, which is then associated with real-world events.