The picture of a rainbow on the front cover of this issue of the Gazette was taken by Nicholas Robins in May 1993. He was mystified that the rainbow was upside down, and wrote to the ‘Notes and Queries’ column in the Guardian asking if anyone could explain why. From subsequent correspondence and discussion it emerged that there were further irregularities. Firstly, it was not raining. Rainbows are caused by refraction of light through spherical raindrops, so how could you have a rainbow with no raindrops? Secondly, this rainbow was in the same direction as the sun. To see a normal rainbow you have to stand with your back to the sun.