500
The weight of a hard boiled egg and regular egg are the same. So without breaking the egg, how can you tell if an egg is hard boiled or not?
Spin the egg, tap it quickly while spinning to stop it, and if it keeps spinning after you let off the egg, it is raw. The liquid inside the egg will continue to move and that's why the egg keeps spinning. A hard boiled egg will just stop when you tap it.