Invention by a British student could save millions of lives across the world

I apologise for the rather crap title but in keeping with HN policy I kept it as close to the article title as possible (shortened only due to 80 character HN title limit).

Personally I would have used something like - "British students' patent-free mini-fridge could save millions of lives".

That's cool. I was afraid it was another method of purifying water.

tl;dr

The device maintains a steady two to eight degrees for 30 days. It works by heating ammonia and water to create ammonia vapours, which are then released into its main chamber when cooling is needed.