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Reindeer antlers grow again each year under a layer of fur called velvet. This reindeer is losing th
Charles Darwin may be dead and gone but a recent write-in campaign has pitted him against Republican
Cardiac catheterization. Insertion of a tube called a catheter through a blood vessel. In this examp
Earth’s history is divided into nested sets of time--eons, eras, periods, and epochs--and is called
People whose behaviors violate norms are often called mentally ill. “Why else would they do such ...
A Gaucher cell showing accumulated fat stored in structures called lysosomes