This was quite hard to answer but after a while i got it, the answer is a glow stick when you break it it glows haha
a glow stick
Mirror
Eggs are more useful after they are broken.
An egg
Eggs
Silence is most useful when broken.
Eggs haha NOT a glow stick
cracking is useful because large hydrocarbon molecules are broken into smaller ones. And these are needed for petrol and are more reactive.
Cracking
Egg
A Catalyst used to "Break Down" Long Hydrocarbons into smaller, more useful ones...
It means that the egg is not useful any more. If in it was a bird or duck or somthing, it means that it is dead.
No you cant because crutches are more useful and you can keep with you at all times of the day
Nope. A broken String is not useful anymore. It should need replacement.