There was a news article recently about a biohacker who inserted a box apparently the size of a smartphone under the skin of his left arm to measure temperature and some other metrics. It was pretty cringeworthy. While in general self-experimenters seem to have a reckless element, most are more reasonable and have had some neat ideas, like attempting to sense magnetic fields with sets of near-microscopic beads in the skin. Would not want to be the beta tester or even an earlier adopter, but it sure does excite Singularians ("adding" a new sense, that is). So yeah, a burning-ear notifier for mentions of the notified on the web would be a good silly project in that vein. Perhaps just glove-warmer coils in some modded earmuffs.
-Arlo James Barnes
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