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Nosebleeds are harmless most of the time, but when they run in the family, recur frequently, or are accompanied by tiny red spots on the skin, they may indicate a rare and serious condition.

By altering the propensity of a molecule to form biologically active states, researchers can fine-tune the molecule’s activity inside cells.

A study led by Columbia researchers finds that deficiency of taurine, a molecule produced in our bodies, drives aging, and taurine supplements can improve health and increase lifespan in animals.