I sink, therefore I am - Tech Learning

I sink, therefore I am

  Make a Cartesian diver using a plastic bottle and either an eye dropper or a ballpoint pen. Don't know what a Cartesian diver is? Find out here.  
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Make a Cartesian diver using a plastic bottle and either an eye dropper or a ballpoint pen. Don't know what a Cartesian diver is? Find out here.

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