Leg swelling related to fluid buildup. Leg swelling caused by the retention of fluid in leg tissues is known as peripheral edema. It can be caused by a problem with the circulatory system, the lymphatic system or the kidneys. Leg swelling isn't always a sign of a heart or circulation problem. You may often experience swelling due to fluid buildup from being overweight, being inactive, after sitting or standing for a long time, or wearing tight stockings. Factors related to fluid buildup include: Acute kidney failure.
Lois Lowry wrote Number the Stars along with many other books.
The HR diagram was created by Ejnar Hertzsprung and Henry Norris Russell. They formed this chart in the early 1900's. They classified the stars by their temperature against their luminosity. The blue and the white stars are the hottest, and the red, orange, and yellow stars are the coolest. The stars are then classified by their size. Giants and Supergiants, Main Sequence, and dwarfs. Stars along the Main Sequence are the most common in size and temperature. The Sun, in which out Solar System rotates around, is found in the Main Sequence group of stars.