You see a headline like that and you probably immediately think...the toilet. Wrong! According to a new study, the filthiest thing in your house is your kitchen sponge.

The sponge has more active bacteria on it than anything else in your entire house. And even if  throw it in the microwave to kill the germs, it doesn't help. The scientists say it makes things worse. So just to be safe, they recommend changing your kitchen sponge once a week.