The human body produces and destroys 15 million blood cells every second.
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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.
The Scale of Life 2
Life-cycle of the Sun; sizes are not drawn to scale.