I know fertility is rarely 100%, and there is no way of testing fertility before setting eggs. So what does everyone do with the inevitable (though hopefully only occasional) clear eggs at the first candling? Just throw them away? Cook them up and feed them back to the chickens? If it were early enough (say day 3-4) could you blow the clear eggs out to save the egg shells, or will cooking at 100 for a few days be enough to turn them into stink-bombs not worth blowing out?