It is easy to take for granted many scientific ideas and results that seem commonplace and reasonable to us today. However, when some ideas were first proposed or discoveries made they were greeted with scepticism, and even ridicule. In 1913 the Braggs determined the crystal structure of sodium chloride. They were awarded the Nobel Prize in Physics in 1915. However, as late as 1927, the following letter appeared in Nature. [Double click if you want to read a larger version]. I recently became aw