in elementary school, my teachers would say, “if you need a straight line use a ruler,” but how did they get a ruler to be straight? it must have come from a machine or something, but how did people get the first one?
one way I’m imagining it is if you stretch out a string taut you can get a straight line, but how was this applied to everything else that uses straight lines?
is there something in nature that is perfectly straight?
In: Engineering
Use gravity to help you make a straight line if you want to see such things in nature. Tie a string around a stone; hang the stone over a nearby branch; gravity gives you a straight line.
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