bugsnag.com

0dAgM TIL the first Ariane 5 launch failed because software engineers left redundant code from the previous version of the rocket. A 64-bit FP variable was made as an input to a 16 bit integer, resulting in an integer overflow that crashed the rocket's launch computer.
epBL6 TIL the term “debugging” comes from an incident that occurred while Grace Hopper was working on the relay contacts of the Harvard Mark II. A moth flew into the computer and was electrocuted to death. Hopper literally had to “debug” the computer which is where the term came from.
Lkryp TIL in 1996 the Ariane 5 rocket exploded 37 seconds after liftoff because of a software error