Its because through out most of that 190,000 years we were hunter gatherers living in small nomadic populations. Once we began cultivating our own food, rather than hunting and gathering it, it gave us time to explore other aspects of our humanity. Food wasn’t in such scarce supply so family’s grew larger. Because we weren’t spending much time hunting and gathering anymore we could spend more time pondering. From this comes different forms of art, the invention of the wheel, etc. Because each invention grows on the last you get an increased rate of new inventions. Take for example the computer: the first thing that we would consider as a computer was created back in the 70’s (just over 40 yrs ago) yet now the phone you are holding has more computing power than that firs computer.
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