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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

Even though putting one foot in front of the other is the easiest form of exercise there is, it's still hard to find the motivation to bypass the car and head out on foot in your everyday life. Here are 25 cities to get started.