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Word formation for business English

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The history of the United States is what happened in the past in the United States, a country in North America.

Periodic table, in full periodic table of the elements, in chemistry, the organized array of all the chemical elements in order of increasing atomic number—i.e., the total number of protons in the atomic nucleus. When the chemical elements are thus arranged, there is a recurring pattern called the “periodic law” in their properties, in which elements in the same column (group) have similar properties. The initial discovery, which was made by Dmitry I. Mendeleyev in the mid-19th century, has been of inestimable value in the development of chemistry.

Sport In Deutschland interessieren sich sehr viele Menschen für Sport. In den Zeitungen, im Radio und im Fernsehen wird regelmäßig über Sport berichtet.

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In the previous two lessons you learned the fundamental difference between ser and estar – essence or condition (“what” something is v. “how” something is), as well as some common uses for the verb ser. This lesson examines the other Spanish verb for “to be”: estar.

Why is it hard to move a heavy bookcase across a carpeted floor? And why is it easier to keep it moving than it was to get it started moving? You might think it's all about weight, but actually it's about friction. Two kinds of friction! In today's episode of Crash Course Physics, Shini Somara tells us about Static and Kinetic friction; how they work and how they're different.