The first US airmail stamps were issued, costing 24 cents.
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Brazil introduced the Golden Law (Lei Áurea), signed by the Princess Imperial of Brazil, which abolished all forms of slavery.
An assassination attempt was made on Pope John Paul II.
An Australian man became the first to circumnavigate the world in an amphibious vehicle.
Three astronauts, Richard J. Hieb, Thomas D. Akers, and Pierre J. Thuot, simultaneously walked in space for the first time.
OpenAI's newest version of ChatGPT, GPT-4 Omni (GPT-4o), went live.
