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Title: Valuable and extremely tiny
Review: Expressed in terms of days added to your life-span divided by packing volume, this may be the second most valuable object you can own in an outdoor survival situation. Unless, like Burgess Meredith in that old episode of the Twilight Zone, you can't read small print without your eyeglasses, in which case you will have just succumbed to a new wave of natural selection.
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