Tau protein buildup in the brain has long been associated with Alzheimer's disease, but it has been unknown how tau becomes tangled and toxic. New techniques are mapping tau's development.

Suppressing a previously unknown protein, aggregatin, may be able to slow the progression of Alzheimer's disease (AD). Aggregatin accumulates within the plaque in brains of those with AD.

Combined results from 3 studies spanning 50 countries has found no link between moderate egg consumption (about one egg per day) and heart disease and cardiovascular-related mortality.

Stress activates the fight-or-flight response, which can cause permanent damage to stem cells in hair follicles that regenerate pigment. Stress leads to the premature depletion of the pigment reservoir.