There's still a lot of work to do, and Nanek hopes that with more powerful hardware the facial recognition feature could be left running constantly, removing the need to snap and upload photos.

ENGADGET: MedRef for Glass uses facial recognition to identify patients, keeps health records

These products should be cooked until they are piping hot throughout, with no pink meat left and any juices running clear, it says.

BBC: Rare steak 'is safe to eat'