...saving the human race from extinction...
I believe, that's indeed the ultimate goal of any true human being. The life on our planet is so fragile that it can become extinct any moment, even as we speak, without a prior warning (Supernova flash, decent asteroid impact...), and there is a very little we can do about it so far, especially with an egoistic approach to our personal survival.
Regarding the "the treasure of knowledge stored for posterity on your SD card". Thanks, I feel like a virtual Noah now, EDCing around 30Gb of precious survival knowledge... However, looking back at the "aluminum foil" discussion attempts above, I can tell for sure now that having some early grades schoolbooks stored on the phone was a smart decision on my part, for posterity or not

In fact, the information you store on your PDA must have an immediate reference value (thus, by the way, the old Russian schoolbooks, which were made extremely to the point at that time, leaving lengthy explanations, examples, and exercises, typical for american schoolbooks, my son's using, to the teacher and in class work). Also, one should keep in mind, that books are good for deeper understanding of things, but dedicated apps are even better as they are providing ready to use tools, with the minimal learning curve required to use them, as any app is encapsulating not just many bits of diverse knowledge scattered in several books, but also proven scientific approach of applying them to the surrounding reality as well.
9/11, Katrina, the Nepal earthquake, Syria - just a few familiar examples. Some of that stuff is actually happening as we speak. Just not to us (enjoying a quiet online discussion on our PCs, smartphones and WiFi gadgets) at this particular moment, but to real people somewhere far away.
If you watch some real footage from around some of the most recent SHTF events, and observant enough, you would immediately notice, that almost all the refugees hold on their smartphones even when storming the barbed fences or throwing rocks. During the two civil wars in Russia with Chechnya, Chechen rebels were widely using smartphones while hiding in the woods, and were charging them daily with makeshift crank chargers made out of logs:

That's definitely nothing to do with your imaginary "couch wars". Chechens won that war, by the way, from Russia (contrary to the Russian official statements); and one of the major contributors to that was exactly the modern electronics technology, as the Russian army's personal communications and data mining technologies deployed on the battlefield were decades behind what rebels' supporters money could buy from the West at the time.
By the same token, if your problem can be solved with a smartphone app... It's probably not actual SHTF/TEOTWAWKI/end of days mega disaster.
LOL. I thought that problems are solved by smart people, leveraging the common knowledge and resources available, not by any talking smart tools themselves...
