You're outside. The sky is getting dark. And all of a sudden you see it—a flash of lightning. The power of nature.

So, what should you do to keep yourself safe?

First of all, remember that lightning can travel 10 miles ahead of a storm, which is about the distance from which you can hear thunder. So if you hear it, go find a sturdy building with a roof and walls. That garden shed won't work.

Don't use phones with cords or computers or other electrical devices.

And keep away from sinks or other plumbing, which can also transmit lightning's energy.

Cars can also provide a safe haven. But, despite popular opinion, it's not the tires that protect you. It's actually the metal structure, which disperses the energy.

If you are stranded outside, and can't get to a safe structure, find the lowest spot available, crouch down and stay away from other people.

Steer clear of water or metal of any kind, such as fences or poles. And stay well away from trees, which are natural lightning rod.

How about that old adage that lightning never strikes the same place twice? Not true. Tall buildings like New York City's Empire State Building, for example, can get hit more than a hundred times a year.

Though you never know exactly where lightning may strike, using a little common sense can make your experience with lightning just a flash in the pan.