The first US airmail stamps were issued, costing 24 cents.
Source
OpenAI's newest version of ChatGPT, GPT-4 Omni (GPT-4o), went live.
Brazil introduced the Golden Law (Lei Áurea), signed by the Princess Imperial of Brazil, which abolished all forms of slavery.
Reggie Jackson became the first major leaguer to strike out 2,000 times.
The first British-made jet bomber, the English Electric Canberra, made its first test flight.
The Beatles movie, 'Let it Be,' premiered.
