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Physiology

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a giant clam

JUST THE FRILLS  Showy blue and green frills are the only visible parts of a kind of giant clam that traps itself for life inside the rocky mass of a reef by a process that’s been misunderstood for decades.

four cups of coffee

CUPSA JOE Studies have shown that people who drink four cups of coffee a day have a lower risk of dying of a heart attack. A new study in mice may show one reason for that; caffeine in coffee gives cells energy to fight off damage.

green blooded lizard

BLEEDS GREEN The few lizards with green blood, such as this green skink from Papua New Guinea, may have acquired the coloring via a spotty pattern of evolutionary history. Their muscles, bones, tongues and gums also look greenish.

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