__The fully revised edition of Rupert Sheldrake's controversial science classic, from the author of the bestselling Dogs That Know When Their Owners are Coming Home, celebrates its 40th anniversary in 2021!__ After chemists crystallised a new chemical for the first time, it became easier and easier to crystallise in laboratories all over the world. After rats at Harvard first escaped from a new kind of water maze, successive generations learned quicker and quicker. Then rats in Melbourne, Aust ...