What goes through cities and fields, but never moves?

Client Dempsey living in one of the East Coast states of the U.S. was talking to Landon Donovan, who was living in the West Coast state of the U.S.

Dempsey: What time is it?
Donovan: Wow, It is the same time here.

How is this possible?

Why do Chinese men eat more rice than Japanese men do ?

What number should come in place of the question mark below?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

What does below pictogram mean?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

A convention is held where all the big logicians are summoned. The master places a band on everyone's forehead. Now all of them can see others bands but can't see his own. Then they are told that there are different colours of bands. All the logicians sit in circle and they are further explained that a bell will ring at regular intervals. The moment when a logician knew the colour of band on his forehead, he will leave at the next bell. If anyone leaves at the wrong bell, he will be disqualified.

The master assures the logicians that the puzzle will not be impossible for anyone of them. How will the logicians manage ?