In much of the tropics, insects, heat, and humidity meant that even if texts were written on palm leaves and animal skins, they had to be deliberately preserved or copied perhaps once in a generation in order to make their way down to us today. This wasn’t the case in England or China; a locked wooden box in a parish church or town hall would be sufficient to keep a piece of parchment safe and few special measures needed to be taken. The medieval historical record is thus inherently biased in favour of societies in temperate climes. {read}