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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.
When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).
Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.
There are 20 feet of blood vessels in each square inch of human skin.
Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.
![Peripheral veins used in intravenous therapy; A, forearm; B, dorsum of the hand; C, dorsal plexus of](https://biology-forums.com/gallery/47/medium_18099_26_09_12_4_30_04.jpeg)
![Stretch the cervical muscles with neck in lateral flexion. Place one hand on the shoulder and the ...](https://biology-forums.com/gallery/33/medium_380798_23_08_17_3_35_47_331541180.jpeg)