The Float-A-Pet collar is two gadgets in one: a water-sensing inflatable floaty, and an LED locator. The other dogs may make fun of him, but that's a trade-off he's probably willing to make.

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Holland may soon be dotted with floating buildings as Dutch architects plan against global warming. The country is already 20 percent below sea level, and rising water levels are a concern. A flooded river is no threat to a floatable building with airtight foundations, and with slack built into electricity and water cables feeding it, the whole kaboodle can simply bob upwards. The gallery shows some building concepts, dreamed up by a company called Waterstudio, among others. Melting ice caps? Bring'em on. [Waterstudio, NPR via io9]

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Floating keychains are common, but this is the first time we have seen something like the Waterbuoy: you chain it to whatever valuable object and, if it falls into the water, the contact will fire up a gas valve that will instantly fill a balloon capable of lifting 1kg. The water will also activate a high-intensity LED so you can see it at night. Warning note: never store a keychain in your swimming trunks' pocket. Or else. [Besportier]