Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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Warfarin was developed as a consequence of the study of a strange bleeding disorder that suddenly occurred in cattle on the northern prairies of the United States in the early 1900s.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
Ethics in social research are of vital concern to sociologists. As discussed in the text, ...
Selected Protozoan Infections
Nutrition-related research findings are often lead stories in newspapers, magazines, and on websites