The end of summer

:: politics, economics, doomed

On midsummer’s eve 2016 old people in the UK demonstrated that, by a significant majority, they are xenophobic leeches who are happy to suck the life out of their children and grandchildren, and have now found a way of continuing to do so even after they are dead.

Covariance and contravariance

:: physics, maths, pointers

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.