HCG, or human chorionic gonadotropin, is a hormone present at high levels in early pregnancy. In fact, this hormone is used as a marker in home pregnancy tests. HCG has also been used to treat fertility issues in both men and women.
100th birthday present! Richard Feynman (1918-88), physicist, and his friend Ralph Leighton became fascinated by the remote and mysterious Asian country of T...
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