10 Must-have Survival Tools You Probably Already Have

During emergency situations, cash is king. goodapp/iStock/Thinkstock

Forget the conventional wisdom -- putting a little bit of your hard-earned money under the mattress isn't such a bad idea after all. If you're able to get out of your home in a disaster scenario, you will need greenbacks — not plastic — to pay for things like gas, food and water. When the power goes out, card readers can't operate and ATM machines can't dispense. So, keep some cash on hand [source: American Red Cross].

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