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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.