Image of the photoreceptors in a living human retina made using an adaptive optics scanning laser ophthalmoscope

The world's biggest scientific conference, run by the American Association for the Advancement of Science (AAAS) in Washington, is focusing on what magnifying the big can tell us about the very small.

Science correspondent Tom Feilden reports on how techniques that have been used to boost the power of telescopes are now being applied to the microscope.

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