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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.
Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.