Ball Bearing BoxScience brain teasers require understanding of the physical or biological world and the laws that govern it.
Suppose you have an open topped box that is 5cm x 5cm x 5cm. (capacity: 125 cubic centimetres) Inside the box is a steel ball bearing that is 25 cubic centimetres in size. Next to the box is a two-liter pail filled with mercury. How many cubic centimetres of mercury would you have to pour into the box to completely submerge the ball bearing?
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