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rube goldberg machines are always the best for those
they are fun to build and they dont take TOO much time up.
you have to be motivated and creative, but thats not too hard
if you dont know what a rube goldberg is, type it in to youtube and im sure you will recognize it.
my class recently had to make one (individually) with 15-20 steps in a 2 ft by 2ft by 2ft box. it was actually quite easy and kinda cool watching all the ideas.
its a great project winner
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