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Alzheimer's disease (AD), the most common cause of dementia, causes progressive memory loss, impaired intellect, loss of coordination, and an inexorable decline in the ability to perform daily tasks. The exact cause of the condition is not known and there is no cure, but some therapies may help ease symptoms.

Alzheimer disease is an irreversible, progressive brain disease that slowly destroys memory and thinking skills, and eventually even the ability to carry out the simplest tasks, according to the National Institute on Aging. In most people with Alzheimer’s, symptoms first appear after age 60. Learn more with this slideshow.

Babies that fail to respond to their name by the age of 12 months or that are consistently unresponsive to the voice of a parent may be displaying early signs of an ASD.

Autism Spectrum Disorders (ASDs) are a group of developmental disorders that pose social, behavioral and communication challenges that range from mild to severe. The CDC estimates that one in every 110 U.S. children have an ASD and approximately 730,000 people aged 0 to 21 years currently live with the disorder. On average, boys are four-…