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> PS. Wikipedia, is probably a good start.

It's just an offhand remark by you, but I think it's a very good idea. Wikipedia is quite hit-or-miss, but right now it's at least the equal of any traditional encyclopedia we had in the old days.

But if there's no power and no technology, how do you view your offline copy? At least books have the potential of surviving for hundreds of years w/o too much degradation.

I've always thought a Kindle and a solar phone charger would be a good doomsday survival device. Obviously it isn't quite as durable as a book, but a lot easier to fit in a rucksack and can contain a lot more content.

Easy, print it. They allow it to be downloaded and printed, from what I understand --only drawback is that fast moving topics become fossilized, but all printed books are that way.

I have an offline copy of wikipedia together with the images (especially for diagrams, and plant recognition) on my phone. I also have fairly detailed offline maps of most of the world (including contour lines in some places).

Add some decent solar power to that, and scavenge for spare parts to keep it going, and I plan to be running a First Foundation / Oracle of Delphi pretty shortly after civilization collapse.

Indeed https://twitter.com/erik_kwakkel/status/568368792906153985

I was surprised by the vividness..

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