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NASA identifies eerie clouds linked to UFO sightings over Florida, leaving locals puzzled
which are also known as "hole-punch clouds" or "fallstreak holes." However, in 2010, weather experts finally solved this ...
Hackaday5y
Punch Those Hole-Drilling Blues Away With A Homebrew Punching Tool
With the fate of repetitive motion injury looming due to the need to drill 1,200 holes, [bitluni] took matters into his own hands and built this nifty DIY hole punch for light-gauge sheet metal.