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Author Question: Ms. Lanyan is in the midst of an inquiry project about insects with her 1st grade class. In her ... (Read 5510 times) |
Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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.
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
Thyroid conditions may make getting pregnant impossible.