Intel introduces the 4004, the first commercially available single-chip microprocessor, paving the way for personal computers.
Ray Tomlinson sends the first email between computers on ARPANET, choosing the @ sign to separate user and host names.
U.S. President Richard Nixon's visit opens the way to normalised relations between the United States and China.
North Vietnam launches a large conventional offensive on three fronts in the South, including prolonged fighting at Quảng Trị.
The United States carries out intensive B-52 bombing of Hanoi and Haiphong for twelve days, known in Vietnam as the "Điện Biên Phủ in the air".
Neil Armstrong and Buzz Aldrin become the first humans to walk on the Moon.
The first message is sent between UCLA and the Stanford Research Institute over ARPANET, the precursor of the Internet.