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