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American seniors dies with Alzheimer's disease or another dementia, according to a report published in Alzheimer's & Dementia: The Journal of the Alzheimer's Association in March. The rate increased 68 percent from 2000 to 2010, the report found.

24 percent

How much less likely people are to search for terms related to suicide during the summer than the winter, according to a study in the American Journal of Preventive Medicine that analyzed seasonal patterns of Google queries related to mental illness. Internet searches for other conditions, including eating disorders and schizophrenia, also decreased during summer months.

100 years

How much time has passed since John Watson published "Psychology as the Behaviorist Views it," arguing for the study of observable behavior in psychology. The manifesto set the stage for future theories of learning and established the field of behaviorism.