Dr Barbara Briggs is one of Australia's leading botanists and police used her skills in the 1960's to assist a kidnapping-murder case. But over the course of her 59 years of research at the Royal Botanic Garden Sydney, she's been part of an even bigger investigation: EVOLUTION. Barbara has described and reclassified about 80 species and helped introduce DNA research to the Gardens' science programs - creating a golden age of new understanding in biology. The episode also features the next generation of botanical detectives with Macquarie University students teaching children as young as five how to extract DNA from a banana at a Science Week event.