- 100 years ago: The first virus was found in both plants and animals.
- 90 years ago: The Grand Canyon became a national monument & Cellophane is invented.
- 80 years ago: The food mixer and the domestic refrigerator were invented.
- 70 years ago: The teletype and PVC (polyvinyl-chloride) were invented.
- 60 years ago: Otto Hahn discovered nuclear fission by splitting uranium, Teflon was invented.
- 50 years ago: Velcro was invented.
- 40 years ago: An all-female population of lizards was discovered in Armenia.
- 30 years ago: The computer mouse was invented.
- 20 years ago: First test-tube baby born in England, Pluto’s moon, Charon, discovered.
- 10 years ago: First patent for a genetically-engineered mouse was issued to Harvard Medical School.
- 5 years ago: The first successful cloning of human embryo
