| http://www.w3.org/ns/prov#value | - This means invisible spatial buttons that could be so small that touching your smartphone, smartwatch or other equipped device to a surface will allow you to press that ???button.??? There???s nothing stopping this technology from be squeezed into something as small as a credit card, or being embedded in clothing or other discrete wearable devices like fitness sensors, wristwatches or even tempora
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