I used to determine the state of eggs by their shell i.e. if the shell is cracked, the eggs have been boiled. But sometimes I have found that even though the shell is cracked, the egg whites are somewhat runny!
Is there a special way of boiling eggs on "gas stove"? Is it necessary to cover them while boiling?
EDIT 1: Today I punctured the egg top with a pin, but still the egg cracked on boiling :(
EDIT 2: Today I added a spoon vinegar in the water, and the eggs did NOT crack at all. :)