What are the most influential inventions in human history?

A distinguished history professor I had said the two greatest inventions were:

1. The windmill. It let people create flour from grain very quickly and efficiently.

2. The stirrup. It enabled steady long-term horseback riding, especially for soldiers.
 
A distinguished history professor I had said the two greatest inventions were:

1. The windmill. It let people create flour from grain very quickly and efficiently.

2. The stirrup. It enabled steady long-term horseback riding, especially for soldiers.
 
The wheel,
Spears, bows and arrows and other hunting tools
pottery
using metal
writing (I'm not sure if it is technically an 'invention')

telephone
radio
airplane
internal combustion engines
penicillin and other antibiotics
computers
 
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