And hemoglobin acts as a molecular sponge to soak up the oxygen in your lungs and then carry it to other parts of the body.

There's something called BOLD imaging, which is Blood Oxygen Level Dependent imaging.

So what we're really getting out of this is information of the structure of the brain, but we can also measure the difference in magnetic properties of blood that's oxygenated and blood that's depleted of oxygen.

If you look at birds, which live a long time, cells from the birds tend to be more resistant to a lot of different environmental stresses like high temperature or hydrogen peroxide, things like that.