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Author Question: How can a researcher be sure that threats to internal validity are being ruled out in the design? ... (Read 29 times) |
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.
A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.