April A to Z: X is for the Unknown

By Niall McArdle

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We’re coming up on the end of the A to Z Challenge; only a few more days to go. I’ve discovered a lot of great and interesting blogs along the way.

Speaking of discovery, there is still much that is unknown in the universe.

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Which brings me to today’s letter: X. The letter for the unknown.



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Why is the letter ‘x’ the symbol for the unknown?


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