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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.
For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.