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This Tiny Robotic Pill Eliminates The Need For Hospital Visits In Stomach Cancer Detection
(www.ibtimes.co.uk)
This is a most excellent place for technology news and articles.
They generally don't let the patient try to swallow these without assistance for that reason. A quick gargle with Lidocaine wash to numb the Uvula and lessen gagging, and they just pop it in the back of your throat with a little grabby tool. Works well enough.