To understand more about the link between addiction and genes, science correspondent Miles O'Brien drinks a mixture of 30 grams of pure ethanol and Diet Coke, the equivalent of three stiff drinks, and undergoes a series of tests.

Sep 20

The drug that never lets go

Dickie Sanders was not naturally prone to depression. The 21-year-old BMX rider was known for being sweet spirited and warm -- a hugger not a hand-shaker. The kind of guy who called on holidays. Who helped his father on the…

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