You've probably heard that, once you reach adulthood, you lose the ability to grown new brain cells. But, according to a recent study, that may be just a myth.

Researchers at MIT discovered that, while the changes in the neurons of adult brains were significantly smaller than what goes on in younger years, "the fact that it goes on at all is earth-shattering."

Apparently scientists made their discovery by looking at a set of neurons not normally studied -- called "interneurons." These interneurons make up about 20 to 30 percent of the neocortex (the part of your brain responsible for higher functions -- like thought) -- so, because they're malleable, it means that large-scale changes in adult brains might be possible.

Maybe you can teach an old dog new tricks.