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Question:

I need to know how to build a machine to put the blanket back on while you are sleeping.?

My daughter has to use her imagination to invent something that has not been invented beforeShe is in the 2nd gradeMaterials she can use are straws, cardboard, string, spools, styrofoam trays, yarn, buttons, dry macaroni, boxes, fabric scraps, cupcake papers, pipe cleaners, cardboard tubes, corrugated paper, glue etc.

Answer:

Connect string to the four corners of the blanketUse the spools on straws to make 4 pulleys on axelsYou can either create stands for these to go by the bed or suspend them from the ceiling using string or yarn and probably glueFill four boxes full of buttons and macaroni (to make weights) and connect the boxes to the free end of each string (which are still attached to the corners of the blanket)Make sure the boxes all weigh about the same and each weighs about the same as the blanket(This will keep them from pulling the blanket off the bed and suspending it in the air)Put the blanket on the bed and put the strings over the pulleys and the boxes by the bedEach time you move under the blanket, the boxes should balance out and pull the blanket back to the middle of the bedTheoretically.
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