What earthly discovery or invention to date has had the most influence on mankind?

I would expect the typical response to be something like: "Electricity."
As of 8 AM Friday (Arizona time) we have a clear winner. Electricity has three votes (including mine). There is a 10-way tie with one vote each for the following:
The Zero
Fire making
Neutrinos exceeding speed of light
One's true love
Thinking
Printing press
Germs cause illness
Science
The Internet
Language

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