How do u tell a hard boiled egg from a raw egg?

Didn't know wife had made hard boiled eggs and I added them to the egg tray with the raw ones.:(

Thanks for help. Don't want grandkids to get raw Easter egg. LOL:D

Chuck

Place egg on table and spin, if it spins freely, it is cooked, if it lugs, it is raw.
Spin a few, you will see/feel the difference.