Why Wine Glass Stem is so long?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

John and his wife were living in a rural place. On a particular day, John's wife fell ill and he called the local doctor. When the doctor picked up, he said, "Doctor, my wife is ill. She might have appendicitis."

"This can't be possible! I took out her appendix two years ago myself," the doctor explained.

When diagnosed, John's wife was found to have appendicitis. How can this be possible?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

What is the next number in this matchsticks series riddle?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

The centre of the third figure is empty. What digit should fit inside?

A beggar on the street can make one cigarette out of every 6 cigarette butts he finds. After one whole day of searching and checking public ashtrays the beggar finds a total of 72 cigarette butts. How many cigarettes can he make and smoke from the butts he found?

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?