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And Finally (expect the unexpected)
Bugs can kill.
In the early days of electronic computers they used relays, electromechanical switches that rocked up and down to switch the electrical circuits. Grace Murray Hopper, who was in charge of the team working with the Mark II computer, (an early electromechanical device), found that a moth had flown through the window and blocked one of the relays, so shutting the system down. This is arguably where the term computer 'bug' comes from.
