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gcn.com
gM7Ny
TIL of the USS Yorktown. A US navy ship that was left "dead in the water" after a member of the crew accidentally tried to divide by 0 on it's computers. This caused many of the ship's computer systems to crash, including propulsion resulting in it needing towing back to port.
WkeLB
TIL Seven’s a lucky number if you need to restart the whole internet. Only seven people from the ICANN can restore it in case of a catastrophe. The DNSSEC root key holders would be summoned to a base in the United States to oversee a reboot of the system, using their keys to enable it.
PwlE
TIL in 1998, the USS Yorktown lost all propulsion power and had to be towed back to Norfolk Base when a computer attempted to divide by 0, causing a database to overflow.