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Cnidarians have specialized stinging cells called cnidocytes
The Sun as it appears from the surface of the Earth at Sunset.
The approval of a new drug is a four-stage process: (1) preclinical investigation, (2) clinical inve
Like most world-changing inventions, the printing press of fifteenth-century Europe took advantage o
William Morris, Page from a specimen book with sample proof letters, Kelmscott Press.
St. Matthew, from the Gospel Book of Charlemagne.