From the March 24, 2012, Listverse.
Again, text and pictures at the site.
10. Logical Thought-- millions of years ago
9. Stone Tools-- 2.6 million years ago
8. Fire-- one million years ago
7. Domestication-- 10,000 years ago
6. Wheel-- 6,000 years ago
5. Mathematics-- 20,000 (How about history?)
4. Metalworking-- 10,000
3. Paper-- 100 BC
2. Printing Press-- 1440
1. Vaccination-- 1724.
Another list. I Don't Remember. --Cooter
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