‘Prediction is very difficult,’ said the great physicist Neils Bohr, ‘especially about the future.’ So physics professor and science populariser extraordinaire Michio Kaku is taking on a very risky task in trying to predict the way science will develop between now and 2100. The approach he has taken is to talk to a vast swathe of scientists – the acknowledgements list is truly breathtaking – and as Kaku points out, unlike the work of many futurologists, this is an attempt to predict the future of science based on the knowledge of working scientists, not historians or science fiction writers or sociologists. Surely this is bound to succeed and make a great book? In practice, the result is mixed. Things don’t go well where you use potential developments in science to predict consumer products. What consumers buy is not based on how good the science is – and the sections of the book covering consumer products are the weakest. The trouble is scientists in universities are the last peopl