We're trapped on this very thin slice of perception ... But even at that slice of reality that we call home, we're not seeing most of what's going on.

Just give the brain the information and it will figure it out.

After all, across the population there are slight differences in brain function, and sometimes these translate directly into different ways of experiencing the world. And each individual believes his way is reality.

When the brain activity is kindled in the right spot, people hear voices. If a physician prescribes an anti-epileptic medication, the seizures go away and the voices disappear. Our reality depends on what our biology is up to.

Nothing is inherently tasty or repulsive - it depends on your needs. Deliciousness is simply an index of usefulness.

You´re not perceiving what's out there. You're perceiving whatever your brain tells you.

Your brain is built of cells called neurons and glia - hundreds of billions of them. Each one of these cells is as complicated as a city.