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New work on the problem of “scissors congruence” explains when it’s possible to slice up one shape and reassemble it as another. If you have two flat paper shapes and a pair of scissors, can you cut ...

Make 3-dimensional objects out of 2-dimensional shapes and use them to send secret messages! Ask, "What’s the difference between 2-dimensional and 3-dimensional objects? Where else do we see ...

Scientists have developed cube-shaped magnetic building blocks that can be assembled into two-dimensional shapes and controlled by an external magnetic field. They can be used for soft robotics ...