January 7 has been marked by groundbreaking discoveries, political milestones, and technological firsts.
Galileo Galilei observed three of Jupiter's four largest moons through his telescope, later identifying the fourth. These 'Galilean moons' provided the first definitive evidence that not everything orbited the Earth.
The Bank of North America, the first commercial bank chartered in the United States, opened in Philadelphia. Founded by Robert Morris to help finance the Revolutionary War, it helped establish the American financial system.
The first commercial transatlantic telephone service was established between New York and London. The call cost $75 for the first three minutes, equivalent to over $1,000 today.
Japanese forces launched a major offensive against American and Filipino troops defending the Bataan Peninsula in the Philippines. The fierce resistance delayed Japan's Pacific campaign but ultimately led to the Bataan Death March.
President Harry Truman announced that the United States had successfully tested a thermonuclear device. The hydrogen bomb was hundreds of times more powerful than the atomic bombs dropped on Japan.
Vietnamese troops captured the Cambodian capital of Phnom Penh, ending the genocidal Khmer Rouge regime of Pol Pot. An estimated 1.5 to 2 million Cambodians had died during Khmer Rouge rule.
The impeachment trial of President Bill Clinton began in the U.S. Senate. Clinton had been impeached by the House on charges of perjury and obstruction of justice related to the Monica Lewinsky scandal.