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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.

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Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.

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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

Walrus tusk engraving made by Chukchi artisans depicting polar bears attacking walruses. On display Walrus tusk engraving made by Chukchi artisans depicting polar bears attacking walruses. On display
Vasectomy. (a) Vas deferens is located within the spermatic cord on both sides. (b) A small incision Vasectomy. (a) Vas deferens is located within the spermatic cord on both sides. (b) A small incision
Cystostomy. An artificial opening is made through the urinary bladder wall during this procedure. As Cystostomy. An artificial opening is made through the urinary bladder wall during this procedure. As
The fibers in silk cloth and in a spider web are made up of the protein fibroin The fibers in silk cloth and in a spider web are made up of the protein fibroin
A healthy diet is made up of well-balanced nutrients. A healthy diet is made up of well-balanced nutrients.
Proteins Are Made of Amino Acids Proteins Are Made of Amino Acids
Video: Uterine (menstrual) cycle - phases

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