I got an advance copy of Anil Ananthaswamy's forthcoming Through Two Doors at Once a while back, and while I was too busy with my own book to read it in time to blurb it, I did manage to finish it ...

This photo shows the upper part of the water tornado model. The acrylic glas tank has a diameter of 50 centimetres and is illuminated with LED strips. The water forms a vortex whose surface shape ...