📜 Week 16 in History
2019 · Week 16 (2019/04-15 – 2019/04-21)
1971
The first Space Station, Salyut 1, is launched by the Soviet Union.
2000
The first Earth Day celebrated globally, with 200 million participants in 141 countries.
1995
Amazon.com sells its first book: "Fluid Concepts and Creative Analogies" by Douglas Hofstadter.