Tester's Day - Worldwide Weird Holidays Tester's Day - Grace Hopper is credited with finding an actual bug in a malfunctioning computer - Another true story at Worldwide Weird Holidays.

Tester’s Day - On September 9, 1945, while running tests on the Mark II Calculator, Grace Hopper found a moth had landed between two solenoid contacts, shorting out an electromechanical relay. An actual bug. www.worldwideweirdholidays.com/testers-day/ #testersday #gracehopper #worldwideweirdholidays