Batteries be should not be disposed with ordinary trash due to their flammable nature. They should go with the hazardous waste for recycling.
It is supposed to be like that because the hard eggshell protects it from bacteria. If its to hard that might be because of low humidity.
Eggshell
The eggshell is porous.
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Used coolant should be properly recycled.
latin word of eggshell
We burn it in the Navy.
It will soften, or even dissolve, eggshell.
Calcium Carbonate is the main component in an eggshell
The eggshell provides protection.