Physical Fitness Test Found in the Spleen

What's a spleen good for? Is it just something to vent when angry? No, it's an organ under the rib cage that can be removed surgically in extreme circumstances. But you should hang onto yours as long as you can. Located just left of the stomach, the spleen serves several functions: filtering blood, recycling old blood cells, fighting certain kinds of bacteria, and storing parts of the immune system including white blood cells and platelets.

Now, a new function discovered at MIT bears the ha...