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One of the oldest unsolved problems in mathematics is also among the easiest to grasp. The weak Goldbach conjecture says that you can break up any odd number into the sum of, at most, three prime numbers (num

Pollution is cheap, for the polluter. Releasing sulfurous fumes into the air or dumping radioactive water into the ocean is ostensibly the easiest and cheapest way to deal with unwanted byproducts.