brains · mind · skull · (fig.) gist (of a matter) · leader · boss

Even our brains are subject to the laws of physics.

What did Brainless and Unhappy do?

I couldn't make her out at all.

Read, every day, something no one else is reading. Think, every day, something no one else is thinking. Do, every day, something no one else would be silly enough to do. It is bad for the mind to be always part of unanimity.