Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
Model of a sequential study in which two cohorts were followed beginning at age 20. One cohort was f
Leonardo da Vinci, Study of Human Proportion: The Vitruvian Man.