What Is Motor Neuron Disease? What Is Amyotrophic Lateral Sclerosis (ALS), Or Lou Gehrig's Disease?

Motor neuron disease (MND) is a serious and incurable form of progressive neurodegeneration - over time the nerves in the spine and brain progressively lose function. In the case of motor neuron disease, motor neurons - types of nerve cells - are affected. The renowned English physicist, Stephen Hawking, and guitar virtuoso Jason Becker are living with motor neuron disease.