Will fresh eggs float in fresh water?

I just had this happen to me and looked it up on an egg site. Floaters are older eggs and can be cracked open to determine if they are edible (no stench-you will know!). They float because of an increase in the carbon dioxide inside the shell as it ages. But it is better to be safe. So if you are hard-boiling, throw it out. If you are cooking eggs, you won't know it's a floater, but you're opening it anyway. Also, in making pan eggs, crack the egg into a container, not directly into the pan. If you have a bad egg hit a hot pan, the house stink is unbelievable; it happened to me once.