Is there any cool easy science things to build?

Im thirteen and i was wonderng if there are any at home things i could build. I want to build a robot or a magnet shooter or something in that category. Not those stupid expirements on all the websites like a valcano expirement. Id prefer if there is no danger at all and you can buy everything at radioshack. I know... show more Im thirteen and i was wonderng if there are any at home things i could build. I want to build a robot or a magnet shooter or something in that category. Not those stupid expirements on all the websites like a valcano expirement. Id prefer if there is no danger at all and you can buy everything at radioshack. I know this alot of things i want, but i want something thats cool and simple that will impress my freinds
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