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Abstaining from a discussion about what constitutes "positive", and coalescing to the constraint to ten things...

1. The use of fire.

2. The use of clothing.

3. The diaspora from Africa.

4. The invention of agriculture, perhaps, though it may also be on the other list (http://www.hubski.com/pub?id=1852).

5. The invention of writing.

6. The development of artificial fertiliser (again, this could easily be on the other).

7. Electrification.

8. The Enlightenment.

9. Epigamic differentiation (love).

10. Nuclear fusion, hopefully.