Funny. Because when I was at school I once wrote a mild scifi story about the future undersea life of mankind - and described a breathing device that essentially only was a mouthpiece with a small electric pump that filters oxygen out of the water. Essentially the thing that they realised now, I even had a look on mind that was not too different from what I see here.
The teacher was not convinced, saying that the idea that the breathing under water would not be restricted by oxygene reserves but the duration of a micro-battery was "absurd".
Hey, Mr. Teacher! We had button cells for clocks already back in the 80s!
I will sue these guys for stealing my idea.
