This is a very nice app, packed with information, and absolutely gorgeous graphics, most of which can be viewed in interactive mode. A must for anyone who is concerned about the population problem, and its impact on our planet, our climate let alone on ourselves, and our co-inhabitants of the world. A minor drawback of the current version is that it does take a little bit of dexterity to freeze or slow down the videos and interactive graphics in order to look at them in greater detail, zoom in, etc. This is especially true of the introduction video, which goes a bit too fast for most people to absorb the message.