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How do you trap a molecule? Very carefully — ba-dum-bum. Seriously, what may sound like the beginning to a corny joke is the work of researchers at New York University, who have created very tiny, "self-assembling cages" to trap molecules, one by one, says Scientific American's Sophie Bushwick. The" cages" are actually three-dimensional truncated octahedrons that self-assemble with hydrogen bonds.

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