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A good spy never leaves any stone unturned. So today, I want to discuss what there is to be learned from the way spies research their targets. Because even if you aren’t a spy, these methods could still come in handy.

Water is absolutely critical for survival. So today’s No. 1 question addresses how to procure clean, clear, drinkable water from any source — even a dirty toilet. Don’t believe me? Well, I’ve got video proof of the gadget that makes it possible.