Lenovo's 'Yoga' Android tablet has a built-in kickstand containing an 18-hour battery

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What does Ashton Kutcher have to do with a couple of Android tablets? We don’t know either. What we do know is that Lenovo just announced a highly unusual device, and it’s unique enough that Lenovo would have had our attention even if didn’t use the “Jobs” actor as a spokesperson. What you see above …