Andrea Bocelli made his classical debut singing at a concert at Teatro Romolo Valli in Reggio Emilia.
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President Richard Nixon signed the US Endangered Species Act into law.
The first American test-tube baby, Elizabeth Jordan Carr, was born in Norfolk, Virginia.
Muriel Siebert became the first woman to own a seat on New York Stock Exchange.
LinkedIn was founded by Reid Hoffman and the founding team members from PayPal and Socialnet.com.
NASA's James Webb Space Telescope began the multi-day process of unfurling its sunshield.
