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Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.

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Children with strabismus (crossed eyes) can be treated. They are not able to outgrow this condition on their own, but with help, it can be more easily corrected at a younger age. It is important for infants to have eye examinations as early as possible in their development and then another at age 2 years.

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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

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There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

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Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.

A missense mutation that causes red blood cells to sickle in sickle-cell anemia. A missense mutation that causes red blood cells to sickle in sickle-cell anemia.
Traction is the application of a pulling force to maintain bone alignment during fracture healing. D Traction is the application of a pulling force to maintain bone alignment during fracture healing. D
Cell Cell
Steps in the humoral and cell-mediated immune response Steps in the humoral and cell-mediated immune response
Polyamines for cell proliferation because of their roles in stabilizing duplex DNA structure Polyamines for cell proliferation because of their roles in stabilizing duplex DNA structure
Video: Steps of glucose catabolism

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