Ever eaten things off the floor? Watch this..
15 March 2017 Last updated at 17:26 GMT
We have all heard of the 5 second rule right?
If you're eating your tea now and you drop something on the floor.
Is it ok to pick it up and eat it?
Some of you may think 'Yeah, it's fine' and some may say 'Eww no way!'.
Well science is here with some answers, check out the video