'I Wonder Why the Wind Blows' and other questions about our planet, from Kingfisher books. Rrp £5.99 so get it for LESS than half price here! Colourful, surprising and full of information, the I Wonder Why books have set thousands of young minds buzzing. I Wonder Why the Wind Blows is the perfect introduction to our planet, featuring Earth's insides, mountains, stormy rainforests and more. Glossy paperback. Approx 28cm x 23cm.