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3 answers

Fire.

2006-07-30 06:46:18 · answer #1 · answered by Samurai Hoghead 7 · 0 0

There are a few for me...all important in the time they were created:

Two important early tools that enabled humanity to do more
The wheel
The lever

The printing press - earliest ability to communicate in volume with others.

The internet - communications for the masses

2006-07-30 05:27:24 · answer #2 · answered by Carl 3 · 0 0

Communication led people to think and spread knowledge.

2006-07-30 05:24:55 · answer #3 · answered by McDreamy 4 · 0 0

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