@Robot Girl: you can think of it as a paracetamol pill equipped with a tiny camera and a mini ultrasound transducer (what a doctor uses to visualise babies in a tummy). When you swallow this pill, it starts taking a video and if there are any suspicious spots for example, you can see it afterwards on the recorded video. The ultrasound additionally records everything that is not at first visible. With this you can find cancer for example at an early stage, so that it’s still curable. I hope I explained it OK, if not ask again 🙂
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Robot Girl commented on :
You explained it fine thanks. Hopefully it helps lots of people:)