Answer:
It comes from crystal and melts to a treat. Add it to your tea to make it sweet. What is it?
You have it even if there is none.
Before Mount Everest was discovered, what was the highest mountain on Earth?
What is filled with air and sometimes a gas, tied to a string and often seen on your birthday?
When is 1500 plus 20 and 1600 minus 40 the same thing?
It is something you will never see again.