About 10 of
link the population is left-handed and it was not unusual once upon
link a time for lefties once they started school to be forced to write with the right hand the Soviet school system enforced this uniformly for instance. There are many reasons for this including cultural bias against lefties
link and the fact that many appliances and tools are designed on the default assumption that the right hand is the right hand. A mechanical can-opener is just one example.