Not that we needed a reminder. Every day, headlines testify to the tensions simmering just below the surface across the Middle East, a region that satisfies over a quarter of the world's oil demand, with cargoes sailing through its vital shipping lanes and vulnerable "choke points" like the Strait of Hormuz. This is not the first time that Qatar has been diplomatically isolated by its Gulf Cooperation Council peers. Saudi Arabia, the UAE and Bahrain in March 2014 recalled their ambassadors from Doha, accusing it of meddling in their domestic affairs.

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Entropy is the pervasive tendency for organized forms of matter to gradually disintegrate into lower and lower levels of organization. A city, if it were deserted would eventually disintegrate. The metal in the city would rust, the mortar in the buildings would crack, the wood would rot, etc. In time, less and less differentiation would exist until, if the area were a closed system (no new energy was brought in to rebuild the city), all of the molecules would be evenly distributed within a given area. Diffusion, the tendency for molecules to distribute themselves throughout an area, would occur. (source)

 limits, functions, derivatives, integrals, infinite series