Doctors in London have started trials of an experimental therapy that might one day become a new way to destroy cancers.
By using powerful ultrasound waves, they can burn away tissues in the body - and one day, tumours - without leading to side-effects in the patient.
The technique is called High Intensity Focused Ultrasound (HIFU), which concentrates high-power sound waves to create heat in the same way that a magnifying glass can concentrate sunlight to burn paper.
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