SlashGear has revealed a Walmart patent for an autonomous shopping cart or at least a robotic assist that can enable a cart or even deliver a cart if you find yourself wishing you’d picked one up before grabbing too much stuff.  This is an interesting concept … I don’t shop at Walmart stores mainly because they are not nearby.  Instead we use Target and Costco where I can’t tell you the number of times my ankles and achilles has been endangered by reckless or very important shoppers.  I wonder if this cart’s system will be able to help avoid others which is probably the most valuable service vs just simply enabling basic physical activity.