Check this 3 min.  video clip about the creation of the 24 time zones for the world.

Check this 8 1/2 min.  video clip about the weirdest time zones in the world.

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After you finish taking notes and  working on your homework, if you need help, check this 4 1/2 min.  video clip I created to help you find time  differences between cities and countries around the world.