Secrets of the Moon
The Moon is Earth's only known natural satellite, the fifth largest satellite in the Solar System. It is the largest natural satellite of a planet in the Solar System relative to the size of its primary, having a quarter the diameter of Earth and 1⁄81 its mass. The Moon is the second densest satellite after Io, a satellite of Jupiter.
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Money worries may age your heart as much as serious disease
Money worries may age your heart as much as serious disease.... We often talk about heart health in terms of diet, exercise, and genetics....
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