Daniel J. Siegel, neuropsychiatrist and author of the bestselling book Mindsight, and parenting expert Tina Payne Bryson demystify the meltdowns and aggravation, explaining the new science of how a child's brain is wired and how it matures. The "upstairs brain," which makes decisions and balances emotions, is under construction until the mid-twenties. And especially in young children, the right brain and its emotions tend to rule over the logic of the left brain. No wonder kids can seem-and feel-so out of control.