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The Origin of Bugs 🐛

How computer bugs were first found and "debugged" · Try a code challenge · Ask our CEO anything · Google's key search algorithm, explained · Read more in our newsletter!


The "First Bug": Found 70 Years Ago

September 9, 1947: Grace Hopper's computer science team at Harvard encounters puzzling errors and technical glitches with the Harvard Mark II computer. Eventually, operators trace these glitches to their source: a dead moth in a relay. Placing the moth in their log book, they cemented a new meaning of the word "bug."

While the team's insect encounter popularized the terms bug and debugging, theirs was merely the most literal of a long line of "bugs" that have preyed upon even the greatest of programmers and engineers for hundreds of years:

  • Ada Lovelace first noted how software can contain errors in 1843
  • In 1873, Thomas Edison invented a "bug trap" to isolate false telegraph breaks and coined the term "bug"
  • 1892: Thomas Sloane's Standard Electrical Dictionary defines bugs as "any fault or trouble in the… working of [an] electrical apparatus"

What will you debug?

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This Week in Tech History: Google Patents their First Search Algorithm, PageRank

September 4, 2001: Google's founders are granted a patent on the algorithm they use to rank search results.

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