Did you know?
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.
Did you know?
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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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.
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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
Did you know?
For high blood pressure (hypertension), a new class of drug, called a vasopeptidase blocker (inhibitor), has been developed. It decreases blood pressure by simultaneously dilating the peripheral arteries and increasing the body's loss of salt.
The structure of a typical flower.
A typical eukaryotic cell.
A typical large tool box, showing just one of many drawers.
A typical electric cooling fan assembly after being removed from the vehicle.
A typical two-wire coil-on-plug ignition system showing the triggering and the switching being ...
A typical output driver. In this case, the PCM applies voltage to the fuel pump relay coil to ...