I travel all around the world but always stay in the corner. What am I?

How many words can a pen with half refill write?

What is the fastest way to double your money?

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different.

How do you measure 45 minutes?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

If 1+9+8=1, what is 2+8+9?