| http://www.w3.org/ns/prov#value | - Ballas thinks that if videogame developers focused their efforts on creating games that also provided a cardiovascular workout, ???there is a real chance of striking a blow against childhood obesity.??? To that end Ballas outlined the type of content descriptors he would like to see:Similar to Food and Drug Administration-mandated labels on food, an exercise rating system could estimate the calori
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