Our roundup of new products and technological innovations prompted readers to share their excitement about the cool things that await them in the future. But some were troubled by the cloned dog Snuppy

I truly enjoyed your selection of the best new inventions [Nov. 28]. I liked the ENV hydrogen-powered motorcycle and the Shift tricycle, whose rear wheels move closer together at higher speeds and separate for balance at slower ones. But I was most impressed by the LifeStraw [a drinking tube with powerful filters that can prevent waterborne infections, which kill millions of people in the developing...

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