We have a new and exciting hypothesis that involves a new system that controls movement in the absence of dopamine.

The mice recovered a lot of their normal movement.

Virtue is not the absence of vices or the avoidance of moral dangers; virtue is a vivid and separate ting, like pain or a particular smell.

How can you know what is missing if you’ve never met it? You must know of something’s existence before you can notice its absence.

Our studies show these abilities are universal, and they develop in the absence of instruction. You don't need to take a class in geometry, and you don't need to learn from a teacher what a right triangle is in order to show this sensitivity.

The absent are like children, helpless to defend themselves.