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Nanosensors are a technology that may exist in the future. The closest thing in existence to these currently are MEMS (Micro Electro Mechanical Systems) devices. A MEMS biosensor may be based upon a thin film bulk electric wave resonator, with some components of it less than 100 nm. They work in a similar way to quartz crystal microbalances, but at much higher frequencies, 3 GHz and beyond. They have been fabricated by the famous biological nanotechnologist Dr. Gregory Ashley at Cranfield University as part of his doctoral thesis. They can be used in nanorobots which when injected inside a human being could be used to detect inimical human tissues .