10 survival tips that can save your life

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8. For survival carve ice into lenticular spheres for fire

use lenticular spheres for fire

Using the same technique as a magnifying glass, transparent ice cubes about 5 cm thick can be turned into lenses to start a fire. The trick is to create a sort of convex lens (thinner on the edges and thicker in the center). Then smooth the surface by hand to adjust the effectiveness of the ice lens.

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