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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).

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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.

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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.

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Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.

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Looking at the sun may not only cause headache and distort your vision temporarily, but it can also cause permanent eye damage. Any exposure to sunlight adds to the cumulative effects of ultraviolet (UV) radiation on your eyes. UV exposure has been linked to eye disorders such as macular degeneration, solar retinitis, and corneal dystrophies.

Aerial and close-up views of a large biodiversity experiment in Cedar Creek, Minnesota. Each of the Aerial and close-up views of a large biodiversity experiment in Cedar Creek, Minnesota. Each of the
the comet Encke riding along its pebbly trail of debris (long diagonal line) between the orbits of M the comet Encke riding along its pebbly trail of debris (long diagonal line) between the orbits of M
Messelson-Stahl Experiment Messelson-Stahl Experiment
The Redi experiment. The Redi experiment.
Three days after the Boston Marathon explosion, the FBI released this photograph that had been taken Three days after the Boston Marathon explosion, the FBI released this photograph that had been taken
The engine is rotated until the timing marks on the front of the crankshaft line up with zero ... The engine is rotated until the timing marks on the front of the crankshaft line up with zero ...
Video: Bone Growth and Remodeling

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