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This question has intrigued me for years, and I have a theory based on a few flimsy facts.In my youth, about 10% of my cohort were lefties, but the proportion has been rising and teachers tell me it's now over 20%. That's an awful lot of genetics in one generation!As a student I noticed that several mathematics students were lefties, but very few history undergrads. Some chums produced an intuitive "spectrum" with maths on the left and history on the right, and found a remarkable correlation between mathematical/analytical course content and lefthandedness of students.Many composers are/were lefties but few musicians.Sinistral CEOs earn on average 15% more than dextrals.There is a weak correlation between lefthandedness and speech defects.Now nature doesn't generally do things at the 10% level. Genetics tends to be 50% or "very rare". So here's my theory:Human language, and bipedal locomotion, require a huge amount of brain power. No other species can throw a missile accurately, and chucking an apple core and a ball of paper across the office and into the wastebin one after another without conscious thought, is completely beyond other apes. I think that half of us are born ambidextrous, but half have a genetic defect that, in order to cope with language, locomotion and dexterity (well chosen word!) the brain sacrifices fine control of the left hand. So given that half of us cannot be lefthanded, society evolved around righthandedness.The lucky 50% born-ambis have a choice. Generally, more than half will choose to go with the flow but some will choose to be different and may gain some advantage, possibly at the expense of some speech development, by seeing the world from a slightly different point of view. Hence, as society becomes more tolerant of variation, the number of voluntary lefties has increased towards 25%. Once you have acquired some basic childhood "dexterities" with screw threads, scissors, etc., a lefty gets used to trying different approaches to a problem and making hypothetical leaps as well as following the book, hence developing a flair for analysis and creativity. The only remaining puzzle is why all the Simpsons characters are lefthanded, apart from the customers at Ned's Leftorium.
Why should their be a growth in left handedness I wonder ?....could it be ongoing ? maybe it has something to do with the reversal of the earths poles ! (joke)
Aren't most composers musicians too ?
Did someone actually do a study of the left/right handedness of CEO's ?