Henry Marsh, author of the bestseller Do No Harm, and Jim Olson, paediatric oncologist from Seattle Children’s Hospital, share their experiences in medicine. Is it possible to light up a cancer cell in the brain? Could scorpion venom be the answer? Dr Jim Olson, Paediatric Haematology Oncology Specialist at Seattle Children's Hospital and a member of the Clinical Research Division at the Fred Hutchinson Cancer Research Center, is developing a radical new technique in the field of fluorescent image-guided surgery, Tumor Paint, that has the potential to transform the way tumors are removed from the brain - by using a special paint the make the cancerous areas glow. Dr Henry Marsh is a leading British neurosurgeon whose pioneering work in brain tumour surgery has been the subject of major award-winning BBC documentaries. His extraordinary memoir, Do No Harm: Stories of Life, Death and Brain Surgery, is an international best-seller, nominated for eight major UK literary prizes and the Sky Arts South Bank Show 2015 Award recipient for Literature and PEN Ackerley Prize. He was made a CBE in 2010.