What is a Leap Year?
I was going to answer this question myself, but then @Ms_Elevator posted a link to this, which does it better.
A blog about astronomy, for anyone
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Maths Stirs - One of a collection of posters produced for World Year of Mathematics 2000 and displayed on trains in the London Underground, this one focuses on the mathe...
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How to Use a Spreadsheet to Batch-Upload Events to Your Calendar - The other day I posted... One of my favourite things I've discovered this year is using a spreadsheet to batch-add things to my calendar. Such a timesaver!...
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