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health and illness

People are healthy when all of their body parts work well. Most of the time, we can stay healthy by eating good food, using our muscles in exercise, getting plenty of sleep, and resting if we start to feel sick. But sometimes, we can suffer injuries or become sick even when we take care of ourselves. ... read more

ussr

Former nation extending from eastern Europe E across Siberia to the Pacific Ocean. In the N it bordered on the Arctic Ocean and in the S on China, and on southwestern Asian countries. The USSR, successor to the Russian Empire, was the world’s largest nation in area and was third in population. It co... read more

motion and force

Motion ... read more

how does a calculator work

Calculators translate numbers into binary code to come up with an answer. ... read more

how are the seeds removed from seedless grapes

Seedless grapes are in fact cloned from genetically defected grapevines. ... read more