That is an excellent question! It probably started with a combination of cognitive developments in primates. The ability to use tools, the abillity to learn (I’m sure Laurel has something to say about that), language and the evolution of culture. All these factors would have combined to give us the technology we have today, and the ability to change our techology!
This is one of the things I study- a great question!! Humans have a unique ability to build on information they have learned before. No other animal can do this. That means that once the first cave men came up with a stone hammer, others could see what was good about it and what needed to be changed (you probably do this all the time in one way or another too). Building on better and better things has lead humans to develop computers, sky scrapers and space stations, all from very humble beginnings in the stone age!!
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Ceri-Wyn commented on :
The other answers are far better than mine!