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India's first satellite is launched

Aryabhata was India's first satellite, named after an Indian astronomer of the same name. It was launched by India from Kapustin Yar, a Russian rocket launch and development site in Astrakhan Oblast using a Kosmos-3M launch vehicle. It was built by the Indian Space Research Organisation.

First space station

USSR launched the Salyut 1. It was the first space station from the successful Salyut program and the first space station ever. The first crew, carried to the space station by Soyuz 10 spaceship, was unable to dock. The second crew, from Soyuz 11, docked and stayed for 27 days. Unfortunately, the cosmonauts died during re-entry. Salyut 1 stayed on the orbit 175 days.

Electronics magazine publishes an article on the future of semiconductor components

Moore's law is the observation that the number of transistors in a dense integrated circuit doubles approximately every two years. The observation is named after Gordon Moore, the co-founder of Fairchild Semiconductor and Intel, whose 1965 paper described a doubling every year in the number of components per integrated circuit.

Bicycle day

Swiss chemist Albert Hofmann deliberately took LSD for the first time. Less than an hour later, he experienced changes in perception. He asked his laboratory assistant to escort him home and, as a use of motor vehicles was prohibited because of wartime restrictions, they had to make the journey on a bicycle. Therefore, LSD users call April 19 the Bicycle day.

American chemist Glenn T. Seaborg is born

Seaborg discovered or co-discovered nine of the transuranic elements, plutonium to nobelium. All of them were created by bombarding heavy elements with nuclei of other atoms in a cyclotron. Seaborg also proposed to use plutonium rather than uranium in the first atomic-bomb experiments. His work led to placing the actinide series to the periodic table.

English naturalist Charles Darwin dies

Charles Robert Darwin was an English naturalist, geologist, and biologist, best known for his contributions to the science of evolution. By the time of his death, Darwin had convinced most scientists that evolution as descent with modification was correct, and he was regarded as a great scientist who had revolutionized ideas.

Norwegian-American inventor Ole Evinrude is born

Evinrude is known as the inventor of an outboard marine engine. One fine day he was rowing in a small boat. It struck him that rowing was difficult. He resolved to invent an easier mean of moving small boats through the water for lazy people. In 1909, he constructed the first practical outboard engine.

Anniversaries of the (in)famous