11th February 2021: updated mandel_tk.py, added a few extra images to the Mandelbrot Gallery, and added section on finite precision to the end of the Mandelbrot theory page.
11th January 2021: added Conway's Life.
5th December 2020: added series for sin(x), partly as examples of gnuplot and matplotlib.
24th July 2020: added page on memory latency of Pi and Core2.
10th July 2020: added comparison of Pi and Cray using Mersenne test, and rearranged the menu items for the pages relating to primes.
27th June 2020: added negative numbers and subtraction to from Transistors to a CPU.
11th June 2020: added an optimised Mandelbrot Set.
1st June 2020: site made known to Google, with 34 pages in sitemap.