This year's Christmas is rare. See why its date is once-in-a-century.

Palindrome dates are also much more common than the format of this year's Christmas date. In the 21st century, there are a ...
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This year's Christmas is rare. See why its date is once-in-a-century.

Add Yahoo as a preferred source to see more of our stories on Google. Christmas this year is extra special, and not just because of the presents under the tree. For the first time in a century, the ...