1945: The first electronic computer, ENIAC, was formally dedicated. Developed at the University of Pennsylvania, ENIAC was one of the earliest general-purpose computers and paved the way for modern computing.

1961: The Soviet Union tested the Tsar Bomba, the most powerful nuclear bomb ever detonated. It had an estimated yield of 50 megatons and demonstrated the destructive potential of nuclear weapons.

1974: The United States launched the Mariner 10 spacecraft, which would go on to be the first spacecraft to visit Mercury. It provided important data about the planet's surface and atmosphere.

1995: The first release of the Windows 95 operating system by Microsoft, which significantly changed personal computing with its user-friendly interface and multitasking capabilities.

2015: NASA’s New Horizons spacecraft flew by Pluto, sending back the first close-up images of the dwarf planet and providing valuable data about its geology and atmosphere.