The brain is an enormous network of communication, containing over 100 billion nerve cells, or neurons, with branches that connect at more than 100 trillion points. They are constantly sending signals through a vast neuron forest that forms memories, thoughts and feelings; these patterns of activity form the essence of each person. Alzheimer's disease (AD) disrupts both the way electrical charges travel within cells and the activity of neurotransmitters. New research advances our understanding of the disease, as outlined in a new article.