I sometimes make the mistake of reading the letters pages of newspapers.

I wanted to see if I could write a mildly complicated macro in Racket without becoming too confused. I can, although I am not sure it is terribly idiomatic.

This is the third part of a series on writing macros in Racket for someone used to Common Lisp, although it is mostly independent of the previous parts. The previous parts are part one & part two.

Or: why password strength checkers are useless.

How long might this take, in the worst case?

Three approaches to solving problems on computers.

A model of the planets as black bodies is surprisingly accurate, except in one interesting case¹.

Fog computing is like cloud computing except that no-one can see what you are doing.

Physicists seem still to be taught about tensors as being, essentially, multidimensional arrays with special transformation rules which must be learned by rote. So I wrote a document which tries to present a more useful approach.

Do not eat the free lunch: it has probably been poisoned.

I play the guitar. Something that has been fashionable for some time is what are often called ‘road worn’ guitars. In other words new (but vintage-spec) guitars which have been aggressed in various ways to make them look old.