Is There Anyone in Your Family That's Left Handed?

Every vertebrate animal has two hemispheres. And in the human brain, I think particularly because we've focused on commonalities and ignored 10% of the population that are left handed,. People who are more variable in how jobs get distributed between the twohemispheres. So if you have one of these genetic shifts, then you might have a more balanced brain. And then if you have none, you have a brain that's truly 50-50 - things get closer to randomly assigned.