Brain Health Humans Have the Biggest Brains, and Other Myths About Our Grey Matter Share Pin Email More in Brain Health Brain Food Mental Exercises Healthy Aging Updated May 27, 2016 Are you right- or left-brained? Turns out, you're both. Yup, that's a myth! And so you get all the facts about your gray matter, we're sharing six more not-so-truths you've heard, and maybe even said, about your brain.