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Blocked blood vessels could be cleared with light. Optical tweezers use a laser to grab tiny objects, holding them with weak forces arising from their interaction with the light. Yin-Mei Li and her team at the University of Science and Technology of China in Hefei moved blood cells around inside a capillary in the ear of a mouse with the tweezers, unpicking a blockage cell by cell. (see video above). They also used the tweezers to immobilise a red blood cell, mimicking the effect of an obstruction such as a clot.
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