New in The Scientific American:
Blood type may affect brain function as we age, according to a new large, long-term study.
People with the rare AB blood type, present in less than 10 percent of the population, have a higher than usual risk of cognitive problems as they age.
People with O blood type may be more likely to have depression and intense anxiety; children may be at a greater risk of attention-deficit disorder.
People with A blood type may be more prone to obsessive-compulsive disorder; children may be at a greater risk of attention-deficit disorder.
Children with B blood type may have a lower risk of attention-deficit disorder.