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4:20 — the cultural code of a generation
420 (four-twenty) is an international code associated with marijuana. Legend has it that in 1971, a group of California students agreed to meet at the Louis Pasteur statue at 4:20 after school. April 20 (4/20) became an unofficial holiday.
Culture
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April 20 — Hitler's birthday
Adolf Hitler was born on April 20, 1889. The coincidence of the date 4/20 with his birthday is exploited by neo-Nazis, making 420 simultaneously a symbol of counterculture and a target for provocations.
History
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CO₂ above 420 ppm — climate milestone
In 2023, the concentration of CO₂ in the atmosphere exceeded 420 parts per million (ppm) for the first time — a record for the past 4 million years. This is an alarming marker of accelerating climate change.
Science