You have to be a certain weight to be considered healthy. The weight of a package or letter determines how much you are going to end up paying for that package to be sent. You have very strict weight limits for going anywhere on a plane. The weight of everything is measured very carefully. The weight of how much chemicals you have in certain things will make a huge difference. As a child you first learn to measure the weight of things. I just think it is interesting how weight is so important to the world.
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