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Approximately 200,000 BC- 50,000 BC: Various hominids are living in small, roaming groups; the majority of humanity has become righthanded

Note that by now the majority of humanity has likely become right-handed. Why? Perhaps because of the differences in vulnerability to ingesting mind-altering substances-- since left-handedness and right-handedness traits seem to be accompanied by such differences in psychoactive susceptibility.

Right-handed people are less sensitive to neuro-toxins than left-handed people. As early humanity often encountered periods of starvation, as well as gradually roamed over more and widely varying terrain and climates, experimentation in foodstuffs was essential. Some plants and animals however contain nerve toxins, and would have done anything from kill or sicken eaters, to bring on hallucinations which would have made them much more vulnerable to accidents or attacks by other people or animals. Ergo, lefthanders, being more vulnerable to such effects, would have died at a higher rate, leaving the predominantly right-handed population humanity will consist of by 1999 AD.

Of course, it isn't a 'clean sweep' for righthanders; a small percentage of left-handers also survive the toxic foods filter, either by accident or some competitive advantage(s) over right-handers in another area, somewhat narrower in scope than resistance to psychoactive food and drink. What might such advantages be?

To see more about the possible differences between left and right handed people, refer to Left and right

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