Comedian George Burns was born on this day in 1896. He and his wife Gracie Allen always made us laugh. But one thing we hope they took seriously was the danger of carbon monoxide. It's odorless, tasteless, invisible and no joke. Carbon-monoxide symptoms include headaches, dizziness and nausea. It can kill you. It is a natural byproduct of combustion in furnaces, fireplaces and gas appliances such as cooktops, water heaters and dryers -- especially ones not working properly. How can you detect this invisible threat? Install a carbon-monoxide audible alarm either battery-operated, or better yet, for a few extra bucks, one that plugs in the wall. Today's homes are sealed up nearly year-round for winter heating and summer cooling. So you should put one on every level in your home. And that's the On The House tip for today.