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Reindeer antlers grow again each year under a layer of fur called velvet. This reindeer is losing th
Apparent and True Orbits of Alpha Centauri.
The anterior pituitary is sometimes called the master gland because it secretes many hormones that r
Diphtheria. The bacteria that cause this disease, called Corynebacterium diphtheriae, proliferate in
True-color image of layers of haze in Titan's atmosphere.
The approval of a new drug is a four-stage process: (1) preclinical investigation, (2) clinical inve