Ask HN: What are the most important innovations in human history?

Spoken language, and written language. For my money, shared communication made everything that came later possible.

My votes are for:

-the use of fire

-the number 0. (Although we can debate if this was invented or discovered)

> -the number 0. (Although we can debate if this was invented or discovered)

Where can I read up on that debate? Any links?

Washing machine. This freed women to do other things, like sandwiches

((The wheel.) (insert Unix joke))

In the name of not repeating anything already mentioned:

magnetic compass

axle

lever

rope

water skins

clothes

Use of fire

Domestication of dogs

Agriculture