There are more nerve cells in one human brain than there are stars in the Milky Way.
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Nearly all drugs pass into human breast milk. How often a drug is taken influences the amount of drug that will pass into the milk. Medications taken 30 to 60 minutes before breastfeeding are likely to be at peak blood levels when the baby is nursing.
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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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Thyroid conditions may make getting pregnant impossible.
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Your heart beats over 36 million times a year.
turbines
Sam, a rhesus macaque, was flown to a height of 55 miles (89 km) by NASA in 1959