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 do you see in the image below

How many times in a given day, minutes and hour clock comes in a straight line ?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

Rearrange the letters in "new door" to make one word.

Which wheel of car does not rotate when you turn your car right?

Which is heavier: a ton of bricks or a ton of feathers?

Can you decipher the below rebus?

PBLUESAISNUERSES

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?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?