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The horizontal fraction bar was introduced by the Arabs.
Historic treatments for rheumatoid arthritis have included gold salts, acupuncture, a diet consisting of apples or rhubarb, nutmeg, nettles, bee venom, bracelets made of copper, prayer, rest, tooth extractions, fasting, honey, vitamins, insulin, snow collected on Christmas, magnets, and electric convulsion therapy.
Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.
Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
![Thoracentesis. A needle is inserted between the ribs to withdraw fluid from the pleural sac at the b](https://biology-forums.com/gallery/47/medium_14755_10_09_12_7_14_27_84951238.jpeg)
![Vasectomy. (a) Vas deferens is located within the spermatic cord on both sides. (b) A small incision](https://biology-forums.com/gallery/47/medium_14755_16_10_12_12_27_39_94332233.jpeg)
![Amniocentesis. In this examination procedure, amniotic fluid is aspirated with a syringe that is ins](https://biology-forums.com/gallery/47/medium_14755_26_10_12_5_29_11_9695143.jpeg)