This blog has a really interesting assortment of articles on mathematics and programming. You can use the tags to your right to find topics that interest you, or you may want to have a look at
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Today is the day! Today is the day we take our APL programs and interpret them, so that something like
÷ 1 2 3 -⍨ 1.1 2.2 3.3 can output
10 5 3.33333333.
Take out a piece of paper and a pencil, I am going to ask you to write some letters in your sheet of paper and then I am going to challenge you to fold the sheet of paper... with a twist!