Hnida: McCain's Cancerous Brain Tumor 'A Tough One'Sen. John McCain has been diagnosed with an aggressive brain tumor called a glioblastoma.
Top Job For Gray Hair?We can see the gray hair and wrinkles affecting the people sitting in the Oval Office. But does the appearance really reflect the toll the job takes on the body? Dr. Dave Hnida looks at a new study on presidents and aging.
Why Living High Is GoodA new study shows why a "Rocky Mountain High" may be help you live longer. Dr. Dave Hnida explains how living in our "thin air" may add years to your life.

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