Delete My Browser History bracelet

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Now you too can wear the items that appear in memes. I've said before that private browsing/incognito mode renders deleting browser history unnecessary, but maybe with this thing on your wrist you'll actually remember to use the privacy preserving features of your devices and won't actually need your history deleted. Too bad it doesn't just say "Use Private Browsing". Alternatively, if you're trying to remind yourself, you could just write it directly on your hand.

Smart Jewelry

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Normally I'm skeptical of "smart" technology, but this high-tech panic button disguised as jewelry actually seems like a pretty good idea. My only concern is whether it's transmissions can be used to track you. That might not be the threat model this is meant to address, however. I imagine run of the mill attackers on the street aren't employing sophisticated signal tracking equipment, and the kind of people who do employ it are going to need something more than just a panic button to deal with.