What's the Correct Order? | Choices |
1. (1492) | Radioactivity |
2. (John Walker 1827) | Anesthesia |
3. (Charles Goodyear 1844) | Vulcanized rubber |
4. (William Morton 1846) | Penicillin |
5. (Oil workers c. 1850s) | Vaseline |
6. (Henri Becquerel 1896) | Play Doh |
7. (Alexander Fleming 1928) | The Americas |
8. (Percy Spencer 1954) | Friction Matches |
9. (Noah and Cleo McVicker 1956) | Pacemaker |
10. (Wilson Greatbatch 1962) | Microwave |