We know that the moon influences the tides, but did you know that with the full moon, you always see the same side of the moon? Or that a yawn is contagious for humans and some animals? And what precisely causes birds not to bump into one another when they fly in a swarm and they swerve? These facts are part of a massive amount of knowledge about nature, physics and space that the RSG programme Hoe verklaar jy dit? has been sharing for 37 years. This book, translated from the original, bestselling Afrikaans version, contains a selection from the hundreds of questions curious listeners have been asking the experts to answer in order to make the world a little less strange, because not all knowledge is obvious. There are so many wonderful enigmas in nature and space that beg to be explained – and we won’t even mention man made inventions!