Dan Rivers travels to Alice Springs in Australia to ask why so many feel the country continues to fail its indigenous population and whether a proposed referendum on introducing a permanent Indigenous Voice to Parliament might be one step towards righting long-standing wrongs. James Mates travels to Portugal to meet campaigners on both sides of a controversial new euthanasia law. Sangita Lal is in Denmark to hear how 10,000 brains are being preserved to help future generations better understand mental illnesses.