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TIL Stephen Hawking refuses to upgrade his voice program to a more natural sound because he considers it to be “his own personal voice”

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BgQbK TIL the Sun is categorized as a dwarf star.
oRoPK TIL Due to the difficulty of obtaining life insurance for astronauts, crews of the Apollo program devised a plan of signing hundreds of postcards before their missions. Their families would sell the covers in the event of their demise
16KQP TIL that the legendary SR-71 'Blackbird' has plans for a successor, the SR-72 'Son of Blackbird'; this craft would be capable of reaching Mach 6. In 2018, Lockheed Martin announced they would have a working prototype by 2025.
DQaVD TIL: Ionization smoke detectors, one of the two most common home smoke detectors, contain radioactive material (americium-241) to detect smoke. There is no health threat as long as the detector is used as directed and not damaged.
4XAVN TIL: Martin Luther King Jr. is honored in Hiroshima because of his anti-nuclear weapons stance