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Author Question: ________ are used to study people who are unaware that they are being studied. a. Questionnaires ... (Read 22 times) |
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.
Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.