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You and me makes three

Countering the notion that twins develop in one of two ways, the recently discovered "semi-identical" twin confirms a third type of neonatal duo. Neither fraternal nor completely identical, this rare type of twosome is formed when two sperm fertilize a single egg, which then splits.

- CB

Booze, smokes worse than narcotics?

A British study ranking the harmfulness of 20 different drugs claims that alcohol and tobacco pose more social and health risks than marijuana or LSD. Researchers say that the UK's drug-classification system doesn't accurately reflect the dangers of illegal — and legal — substances.

- AB