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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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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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According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.
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Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.
![Water striders serve as a model organism for the study of sexual conflict between males and females.](https://biology-forums.com/gallery/47/medium_33_09_09_11_10_15_38_17251747.jpeg)
![Space-filling model of an actin filament (shades of red) with one myosin head (gray and two shades o](https://biology-forums.com/gallery/47/medium_9828_12_01_13_11_13_18.jpeg)