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TIL US Army has a working prototype of a land-based laser cannon that can be guided by an Xbox controller

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via reddit.com

woj08 TIL about Nitrogen Triiodide - the most sensitive compound in the world. It is so sensitive, exposure to alpha particles can cause it to explode.
4Rjb TIL that the White House increased the numbers of signatures necessary for a petition to get a response after a petition for an American Death Star got enough signatures
9wlEm TIL that back in the day, small-time gunmakers would repurpose punt guns into single-shot elephant guns for cheap, for ivory hunters that couldn't afford the expensive, purpose-built double rifles
8anKV TIL Jim Henson would yell out "blue sky" when a child came to sets. All the muppeteers knew this code and would chill out with bad language and the such.
Z8j9R TIL in 2009 Canada passed the Apology Act, which declared an apology is not an admission of fault and cannot be used as evidence.