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A human embryo is smaller than a grain of rice at four weeks old. All babies are color blind when they are born.A fetus develops fingerprints at eighteen weeks. A woman has approximately 4.5 litres of blood in her body, while men have 5.6 litres. After 8 months, babies are more likely to get a diaper rash. A lifespan of an eyelash is approximately 150 days. A yawn usually lasts for approximately six seconds. A "hairbreadth away" is 1/48 of an inch.
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