kkleiner writes "Scientists at the Center for Systems Biology at Massachusetts General Hospital have integrated a microNMR device that accurately detects cancer cells to a smartphone. Though just a prototype, this device enables a clinician to extract small amounts of cells from a mass inside of a patient, analyze the sample on the spot, acquire the results in an hour, and pass the results to other clinicians and into medical records rapidly. How much does the device cost to make? $200. Seriously, smartphones just got their own Samuel L. Jackson-esque wallet." Link to Original Source
I've never been canoeing before, but I imagine there must be just a few
simple heuristics you have to remember...
Yes, don't fall out, and don't hit rocks.