Roughly 10% of us are left-handed. A new #study says rare gene variants might be the reason some of us are ‘southpaws’. The TUBB4B #gene is involved in controlling the shape of cells and is almost three times more common in the left-handed. It may play a role in the development of the brain asymmetry that underlies the determination of a dominant hand. Neurobiologist Clyde Francks of the Max Planck Institute for Psycholinguistics in the Netherlands is the senior author of the study published in the journal Nature Communications. #Science #lefthanded #paulmccartney @ladygaga #ladygaga #barackobama @paulmccartney