internal

Anyone with some exposure to the martial arts has heard about 'external' and 'internal' martial arts. I wrote this up recently on the issue http://www.statisticool.com/internal.htm Is their vector theory the best they can do? It isn't really a convincing theory I must say.

From the Skeptoid podcast, investigating whether magnets are good for koi pond water (they are hugely prevalent among koi pond owners, and a de facto component of most new ponds). Do magnetotactic bacteria hold some clue that might answer this question? Listen...

I have often wondered if it could be possible to make an internal expansion steam engine where the steam is created directly in the piston chamber (similar to a diesel engine). Diesel engines heat air with compression to an extent that it causes the diesel to ignite (explode). Could compression...