While supermarkets have gone mobile to help you order bread and milk while on the go, wearable tech has remained largely unexplored. Not wanting to be left in the chilled section, Tesco gave its R&D boffins Google Glass and tasked them with helping customers order their groceries while barely lifting a finger. The result was a new prototype Glass app that lets the wearer scan a barcode to quickly add products to their virtual basket or find out their nutritional information. Tesco admits that it would struggle with the rigors of a weekly shop, but says the app perfect for "micro interactions" -- i.e. that time when you realise you've just used the last piece of toilet roll.