Fake smiles and real smiles are controlled by two different parts of the brain.
Not exactly sure what difference between the cerebral cortex and the basal ganglia is? That's okay. Experts get confused too, as with the case of bird brains.
Scientists studying zebra finch brains have identified about 2000 vocalization genes in a brain region known as Area X.
Why does your hand shake from time to time? What causes this reaction?