On 30 August 1998, two Stanford PhD students modified their search engine’s logo before heading to a desert festival. Larry Page and Sergey Brin added a crude stick figure behind the second ‘O’ in Google, a visual out-of-office notice in case their servers crashed whilst they attended Burning Man. That improvised gesture became the first Google Doodle, launching a design tradition now seen by hundreds of millions daily. Also on this date: scientists announced the discovery of an 800-kilometre canyon hidden beneath Greenland’s ice sheet, larger than the Grand Canyon and carved by ancient rivers before the ice arrived. In 2019, amateur astronomer Gennady Borisov spotted the second confirmed interstellar object passing through our solar system, a comet from another star that gave astronomers months to study before it departed forever. And in 2002, America’s first privately operated subway closed in Birmingham, Alabama, a 300-metre line built beneath a department store to ferry shoppers from car park to shop floor. A day of accidental inventions, hidden wonders, and gloriously niche infrastructure.