| 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. |
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30 years ago: The computer mouse was invented. |
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20 years ago: First test-tube baby born in England, Pluto’s moon, Charon, discovered. |
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10 years ago: First patent for a genetically-engineered mouse was issued to Harvard Medical School. |
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5 years ago: The first successful cloning of human embryo |
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