I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

10 people came into a hotel with 9 rooms and each guest wanted his own room. The bellboy solved this problem.
He asked the tenth guest to wait for a little with the first guest in room number 1. So in the first room, there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ..., and the ninth guest to room number 8. Then he returned to room number 1 and took the tenth guest to room number 9, still vacant.
How can everybody have his own room?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

What is the end of everything?

What is the longest word in the dictionary?

Replace the question mark with the number below given a simple math problem.

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?