Twelve North African Christians, known as the Scillitan Martyrs, were executed for their religious beliefs.
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The US National Minimum Drinking Age Act was signed into law, raising the age to 21.
Bill Gates became the richest man in the world with a net worth of $12.9 billion.
The Apollo-Soyuz Test Project completed the world's first international space rendezvous.
American swashbuckler film 'The Mask of Zorro' was released in the United States.
Mary Leakey discovered ancient skull remains in Tanzania, Africa.
