But handedness has its roots in the brain—right-handed people have left-hemisphere-dominant brains and vice versa—and the lefties who claim Einstein weren't all that far off.

Does left brain dominant mean left-handed?

Brain lateralisation and handedness. It is true, however, that the brain's right hemisphere controls the left side of the body, and the left hemisphere the right side – and that the hemispheres do actually have specialities. ... For example, it is often cited that around 95% of right-handers are “left hemisphere dominant”.

Are left-handed people's brains different?

Researchers have identified, for the first time, the genetic differences between right-handed and left-handed people. In left-handed people, both sides of the brain tend to communicate more effectively. This means that left-handed people may have superior language and verbal ability.