The insect that famously shorted out an early computer was a moth trapped in a relay of the Harvard Mark II electromechanical computer in 1947, inspiring the legendary ā€œfirst actual case of bug being foundā€ note in its logbook.

Quick Scoop: What Actually Happened

  • In 1947, engineers working on the Harvard Mark II (an early large-scale electromechanical computer, sometimes dubbed a supercomputer of its era) found that the machine was malfunctioning.
  • Tracing the fault, they discovered a moth jammed in relay 70, panel F; it had effectively shorted part of the circuitry and stopped correct operation.
  • The team taped the moth into the machineā€™s logbook with the handwritten note ā€œFirst actual case of bug being found,ā€ turning a technical glitch into a piece of computing folklore.

Did This Create the Word ā€œBugā€?

  • The term bug for mechanical or technical glitches already existed in engineering slang before this event, but the Mark II moth story cemented its association with computer errors for generations of programmers.
  • Grace Hopper, a pioneering computer scientist involved with the project, helped popularize the anecdote by retelling it, which is why many people link her name closely to this famous bug.

Why People Still Talk About It

  • The story lives on because it perfectly illustrates how very physical and handsā€‘on early computing was: hot relays, huge cabinets, and even real insects causing failures.
  • Today, the original log page with the taped moth is preserved in a museum collection, a quirky but iconic artifact of tech history.

Answer in a nutshell: the insect was a moth , and its unlucky trip into the Harvard Mark IIā€™s relay helped turn ā€œcomputer bugā€ and ā€œdebuggingā€ into everyday tech language.

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