By Kate Kelland, Health and Science Correspondent LONDON (Reuters) – Meet – a feisty and fully-armed virtual nanobot. Billed as « medicine’s mightiest warrior », she’s fighting an epic battle deep inside the human body where she launches rapid-fire assaults on malignant cells. Or, if it’s not cancer but diabetes you’re fighting, why not join Britney and Hunter, two digital kids whose adventures to other worlds are spurred on by regular and timely updates of your blood sugar levels. 

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