A nanotechnologist has created the world's smallest and most plentiful smiley, a tiny face measuring a few billionths of a metre across assembled from strands of DNA. Dr Paul Rothemund at the California Institute of Technology can make 50 billion smileys, each a thousand times smaller than the diameter of a human hair, with his technique. DNA has long been known for its versatility as a microscopic building block. The molecule can be 'cut' using enzymes and reassembled using matching rungs in its double-helix structure.
A nanotechnologist has created the world's smallest and most plentiful smiley, a tiny face measuring a few billionths of a metre across assembled from strands of DNA. Dr Paul Rothemund at the California Institute of Technology can make 50 billion smileys, each a thousand times smaller than the diameter of a human hair, with his technique. DNA has long been known for its versatility as a microscopic building block. The molecule can be 'cut' using enzymes and reassembled using matching rungs in its double-helix structure.
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