When you hear thunder rolling across the sky, take heed. Lightning might be nearby. Today, you'll learn some "en-lightning" facts that every man woman and child needs to know. There are more than 30 million lightning ground strikes annually in the United States. Five-hundred to 600 people are struck, with more than 50 fatalities every year. There are things you can do to protect yourself. First, when you see lightning, determine how close it is by counting the seconds until you hear thunder. Dividing by five tells how many miles away it is; 10 seconds in between means about two miles. When you're outside, avoid open areas and don't stand under a tree. If you're caught in the open, crouch as low as possible. Get indoors as fast as possible and stay away from windows. Don't use electrical appliances or the phone. Find a safe place so that lightning won't find you. And that's the On The House Tip for today.