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While a curve is one continuous motion, you can create the illusion of a curve by using straight lines. In order to do this, draw a continuous pattern of short straight lines, while changing the direction of each line slightly.
"Straight Up" is a term that is used in bartending to explain that the person wants their drink shaken or stirred with ice, but then want the liquid to be drained from the ice before drinking it.
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A random walk is opposite in all senses. A straight line is only a curvilinear path with all the "higher order" terms set to zero.
Put the numbers in order from least to greatest and keep crossing the ends of the number line out.