This is a conspirator's worst nightmare. A tiny chip the size of just one-tenth of a cubic millimeter can be easily injected into the body to monitor its temperature in real-time. All it needs is ultrasound and similar systems are likely to be the future of medicine.
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Is it safe? I understand that it's used only on lab rats so far ... but still. How long will the device function? How does the body get rid of such an item? May it get stuck somewhere in the blood system? Will it circulate forever? My mind is boggling with questions.