Simple. Never. Feet and yards sucks. Metric wins.
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Measurement apps. Ikea product app! Quite a lot of people seemed to like Pokemon and that aHarry Potter game
The true killer apps won’t arrive till proper glasses arrives. Bit like Uber couldn’t exist pre smartphones.
AR Glasses could replace computer monitors and TV sceeen - You could have multiple virtual monitors But it need to have a proper field of vision - not just 50 degrees but 110+
Mapping and location stuff will be key.