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Children with strabismus (crossed eyes) can be treated. They are not able to outgrow this condition on their own, but with help, it can be more easily corrected at a younger age. It is important for infants to have eye examinations as early as possible in their development and then another at age 2 years.
Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.