The vast amount of time between then, and 50K BCE when we started doing all the other interesting human things we are so proud of, is staggering – what were we doing for two and a half million years?! Probably chilling.
(Image source: http://www.jay-matternes.com)
Life might have gotten a boost from tiny pores in hot rocks. http://arstechnica.com/science/2015/02/life-might-have-gotten-a-boost-from-tiny-pores-in-hot-rocks/