HANOI, Dec 1 (Reuters) - Every Tuesday, 79-year-old Nguyen Thi Loc joins a group of grey-haired students to study English at a house in Hanoi, with the aim of socialising and keeping her brain sharp.

You know those word of the day apps to expand your vocabulary? Well, our next guest has an app highlighting words with a twist - like wrath-mod (ph), as in super angry, or lencten-adl (ph), as in ...