Opponents of same-sex marriage participate in the March for Marriage in Washington, D.C., on March 26, as the Supreme Court hears arguments on California's Proposition 8 ban on same-sex marriage. Nicholas Kamm/AFP/Getty Images hide caption

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Amy Goyer moved back to Phoenix to look after her father, Robert, when he began to show signs of Alzheimer's. He is just one of 5 million Americans living with the disease. Sarah Brodzinski hide caption

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Despite significant advances in neurology and imaging, researchers still don't have simple lab tests for diagnosing patients with mental disorders. Diagnoses are still mostly based on a patient's signs and symptoms. BSIP/UIG via Getty Images hide caption

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