As we all head back to school, here are some interesting calendar puzzles:

**2008 is a leap year.**Why do leap years happen? If we didn’t add a leap day every so often, would January eventually come in the summer?**Today is Thursday.**What day of the week will it be exactly one year from today?**January 1, 2008, came on a Tuesday.**When will be the next year that begins on Tuesday?**My birthday (in March) lands on a Monday this year.**When is the next year my birthday will come on a Monday? How about YOUR birthday — when is the next time it will happen on the same day of the week as this year?**Can you find a pattern**in the way dates move from one day of the week to another, year after year?