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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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Blood is approximately twice as thick as water because of the cells and other components found in it.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.