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Author Question: Where has the recent, largest proportion of migrants to Tibet and western provinces of China originate from? (Read 181 times) |
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.
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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.