The move should at least partly put an end to the ritual where flight attendants have to nag passengers to put away their devices before take-off and right before landing.
John Pearce's insight:
Though I don't doubt that there might well be reasonable grounds for turning off devices when on planes during take-off etc, I've lost count of the times that I've reached for my iPad in flight to have found that it was actually on all the time during take-off. DId I really endanger my fellow travellers or not???
This diagram from WIkipedia shows that water moves around the water cycle in lots of different ways. I didn't realise that water went into dams from under the ground as well as via streams. I'm really not sure what sublimation or Evapotranspiration is though.