`predominantly an inherited very talented right brain and to some degree an immature left brain   As the visio-spacial dominant brain supports the opposite of the body, being right brained dominant would usually make the person have a tendency to being left handed. Leonardo was left handed. The natural tendency for the majority of people with a dominant left language brain would be to work from the left dominant brain towards the right side making it natural to write from left to right. However if the right brain was dominant as in ADHD, the tendency would be to write from right to left. Leonardo used mirror righting for this reason. Children with ADHD often reverse letters especially the “b” and “d”, and are often left handed and are also often musical and artistic like Leonardo.  The right brain has talent for art, music, creative inventive and practical handy man ability. Leonardo had all of this. The left brain is the language, formal learning, organized, listening brain focusing on the spoken word.  Leonardo had no or little formal learning.  The right brain is particularly hasty and easily distracted with a poor concept of time. This certainly describes Leonardo if one considers how often he never finished a painting.   With a talented right brain he would also drift from one place to another, never quite settling down. The right brain seems to master mechanical maths very easily and Leonardo was self taught. However story sums (word sums) are done with the left language brain and not easily mastered. The right brain is a very physical brain endowering the person with clear physical abilities and often muscular strength.  Leonardo was allegedly a physically strong person.   The ability to use body language from the right brain  in preference to the spoken word from the left would allow a right brained person to   express him self  visually and spatially with great depth and accuracy. This certainly showed in the great depth and detail of his paintings.  ADHD is very often seen in adopted children who are born out of wedlock and given out for adoption. Leonardo was an illegitimate child. It would seem there is more than enough to diagnose ADHD posthumously in the great gifted artist.  When a psychometric evaluation is done on an ADHD person the non verbal IQ (right brain) is invariably higher than the verbal IQ (left brain.) This is hardly surprising. It can be assumed the artist must have had a gifted IQ   to have done what he was able to do without any formal learning.  He did not need any formal learning for his immature left brain. His creative, artist right brain would allow him to be drawn to art and benefit immensely and enthusiastically from any training he might receive in this field.  He certainly did, even outdoing his teachers.   Einstein and Churchill both had formal learning thrust on them with limited success. Their Visio-spacial brains excelled. The talented right brain often results in hyperactive behavior problems. Churchill and Einstein had behavior problems and Churchill also showed considerable artistic talent. The badly behaved  the visio-special temperamental tennis player, John McEnroe who was also left handed and he certainly able to   express himself with is talented right  brain using rather body language in preference to verbal. Smashing a tennis racket is certainly good body language. The artistically gifted   Michael Angelo was also left handed. So was Mozart and Beethoven.  I as a non diagnosed left handed ADHD person can well remember my problematical early education during the war years when children wrote on slate to save paper. As I wrote across the slate with my left hand I smudged my work as my hand moved across the slate. I did not revert to mirror writing but I certainly confused the letters “b” and “d” (reversals). I received no sympathetic understanding from the ignorant teachers. Luckily my left handed genetically inherited mechanically gifted son was not only recognised but successfully treated. So was the artistically talented Churchill. One wonders what Leonardo might have achieved with correct effective modern medical treatment? Leonardo’s mirror writing was certainly due to a talent many ADHD people have in giving preference to the left hand and easily adapt to using mirror writing. They have a natural talent for reversing the written word.  Dr. W.J. Levin.  —Preceding unsigned comment added by   •       ==Burial place==  Leonardo was not buried initially at St. Hubert's chapel, as the current text leads to believe. He was buried at the collégiale Saint-Florentin, which was inside the walls of the castle. This buildi