Many animals use and make tools. Modern humans (people like you and me) are biologically only 20,000 years old or so. What happened? Enough technology and deve

Many animals use and make tools. Modern humans (people like you and me) are biologically only 20,000 years old or so. What happened? Enough technology and development compounded to make more modern civilization possible. Various technologies may have been developed/invented in the far distant past, but were lost for various reasons.