I sure this has been asked before but here goes. My daughter, 11, is doing a science experiment about how long freshly laid eggs can sit on the kitchen counter before going bad. We are comparing unwashed and washed. The project is due at the end of January. She collected eggs the last week of November - this is when the projects are assigned - topic must be approved by the teacher. Does she have any hope of getting a washed eggs to float in water? How long does a wash egg stay fresh without refrigeration? Thanks for the help.