The children are now in their terrible twos. This episode is focused on memory, and how much we remember from our childhood. It turns out that we do remember more than we realize of our experiences even at this very young age. Trauma such as witnessing the breakup of ones parents, or being unwanted, can have long-lasting effects on a child.

In this episode, Professor Winston looks at the battle for independence. It is very important for children to develop their independence, and they start on this path by standing up to their parents. Some of the first words uttered by a child are usually those that help it to communicate their needs; some children manipulate their parents through temper tantrums. It's important for the parent to be firm with their children, but it's not easy.

What makes a child a potential star athlete, or a lifetime couch potato? Most of not all 2 year olds seem to have perpetual motion engines, but already at this stage, there are active children who can't stop moving, and those who are much slower moving.