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Submission + - Molecular Pentafoil knot

Med-trump writes: Scientists now report that they have made a non-DNA molecular knot.
They created a 160-atom-loop with five crossing points, a molecular pentafoil knot. The researchers used a technique known as "self-assembly" to prepare the knot in a chemical reaction. Apparently 85% of the elasticity of natural rubber is due to knot-like entanglements in the rubber molecules chains.
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Molecular Pentafoil knot

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Numeric stability is probably not all that important when you're guessing.