By Ribenboim P.
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Extra resources for 17eme probleme de Hilbert
The usual scale of USGS maps is 1:24,000; that is, 1 inch on the map equals 24,000 inches, or 2,000 feet, on the ground. Each map covers between 50 and 70 square miles. The maps are color coded. Green is for vegetation, blue for water-related features, black for humancreated structures such as roads and buildings, and brown for topographic features. Updated maps show changes in purple. You can see at a glance where water flows all year and where it flows only in the rainy season, where there are snowfields, glaciers, marshes, or swamps.
If you have the time, space, and energy, a giant SOS, or even a big X on the ground might attract attention. A signal mirror is lightweight, easy to carry, and simple to use if you first practice aiming it. If your compass has a mirror, you can use that, too, but not as effectively. A true signaling mirror is shiny on both sides and has a hole in the middle. Hold it a couple of feet in front of you and point the hole toward your target (say a passing plane). To signal distress, give three flashes by passing your hand between the mirror and your target three times.
Stranger still, search-andrescue teams report that many victims of hypothermia and related problems never even try. In recent years many national parks and other wilderness areas have prohibited campfires in areas that get heavy use, in order to protect fragile ecosystems, and near or above timberline. Backpackers and others are required to use portable stoves for cooking and are expected to dress warmly enough to camp comfortably without a fire. Still, in a life-or-death emergency, fire making is a skill everybody needs to have.
17eme probleme de Hilbert by Ribenboim P.