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Author Question: When conducting a study using, researchers first ________ a sample from a specified population, and ... (Read 50 times) |
People who have myopia, or nearsightedness, are not able to see objects at a distance but only up close. It occurs when the cornea is either curved too steeply, the eye is too long, or both. This condition is progressive and worsens with time. More than 100 million people in the United States are nearsighted, but only 20% of those are born with the condition. Diet, eye exercise, drug therapy, and corrective lenses can all help manage nearsightedness.
Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.
Asthma cases in Americans are about 75% higher today than they were in 1980.
The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.
In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.