Best mobile accessory ever: a microscope

Americans like big stuff. Tech-heads like small stuff. So absolutely the entire nation should love the CellScope, an add-on fluorescent microscope inv

Americans like big stuff. Tech-heads like small stuff. So absolutely the entire nation should love the CellScope, an add-on fluorescent microscope invented by researchers at the University of Berkeley.

And what's not to love? From its cobbled-together Robot Wars chic to its life-saving applications (spotting blood-borne parasites and dangerous bacteria) the CellScope really is the gift for the man who has everything  - or malaria and tuberculosis, at least.

The scientists developed the accessory to allow doctors in developing nations to diagnose a variety of life-threatening illnesses with nothing more than their Nokias.

The CellScope uses LEDs to cause microscopic bugs to fluoresce in a way that can be captured on the phone's 3.2MP camera. The Symbian OS handset can even run image analysis software to count bacteria, turning every phone into a miniature epidemiological lab.