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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.
The cure for trichomoniasis is easy as long as the patient does not drink alcoholic beverages for 24 hours. Just a single dose of medication is needed to rid the body of the disease. However, without proper precautions, an individual may contract the disease repeatedly. In fact, most people develop trichomoniasis again within three months of their last treatment.
Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.
![Killer whales, like this one spotted near Alaska, commonly breach, often lifting their entire bodies](https://biology-forums.com/gallery/47/medium_27599_22_04_12_6_57_26.jpeg)
![Patients should be encouraged to bring to their health care visit all the substances that they take,](https://biology-forums.com/gallery/47/medium_2137_17_05_12_2_10_44.jpeg)
![Patients should be encouraged to bring to their health care visit all the substances that they take,](https://biology-forums.com/gallery/47/medium_18099_13_09_12_10_00_26.jpeg)