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Opaque Marble Balls

Science brain teasers require understanding of the physical or biological world and the laws that govern it.

 

Puzzle ID:#5443
Fun:*** (2.93)
Difficulty:*** (2.26)
Category:Science
Submitted By:im_para_noid*****
Corrected By:boodler

 

 

 



Lost in the woods, you come upon a mysterious stranger who hands you two large spheres made of two kinds of opaque marble. The spheres look the same, are the same size and have the same weight and apparent density; however, one is solid and the other hollow. The hollow sphere contains a tiny map that will enable you to navigate your way home. Unfortunately, you cannot break the spheres. The stranger agrees to open the sphere that contains the map only if you can determine which sphere is hollow. How do you determine which sphere is hollow?




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