From the mystery of earwax and armpit sweat (via polyester shirts) to the intricacies of visual neuroscience and textile technology, Dr Karl's idiosyncratic and compelling insights into the world in which we live will intrigue and inform readers of all ages. After more than 30 years of publishing, Dr Karl is still one of Australia's leading non-fiction authors. He is the Julius Sumner Miller Fellow at the University of Sydney and a science commentator for both the ABC and BBC.