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TIL Arnold Schwarzenegger beat O.J. Simpson for the role of the Terminator because Simpson wasn't "menacing" enough to play a killer.

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Y76LA TIL: Self replicating probes or spacecraft, also called Von Neumann probes was a concept theorized by the mathematician. He argued that this is the most efficient method of space exploration/mining as they can adapt. The concept has been used in various media such as Mass Effect, Star Trek, etc.
v1ARL TIL PCs in the 80s and 90s often had a “Turbo” button which when pressed would counterintuitively slow down the processor speed to allow compatibility with older games designed for slower processors.
LkAx0 TIL of Long-time Nuclear Waste Warning Messages. It's intended to deter any human intrusion in nuclear waste repositories 10000+ years in the future, and warn them in a way that's understandable to that civilization
Ry0a TIL Harold Fairweather, age 96, is believed to be the oldest person to still have a living parent. His mother Violet Brown is 116 years old and her age is recognized by the Guinness Book of Records.
jNeEN TIL that the Unabomber was a victim of MK-Ultra.