Get knotted

Researchers in the UK have tied the tightest knot ever with molecular string, the iron-centered structure which braids several molecular strands could lead to novel materials, according to David Leigh and colleagues at the University of Manchester. Being able to make different types of molecular knots means that scientists should be able to probe how knotting affects strength and elasticity of materials which will enable them to weave polymer strands to generate new types of materials.