There's been talk of changing the packet size of paracetamol tablets, to reduce the self-harm of overdose—but it would be better to investigate and remedy why this harm occurs. The idea that society—as well as an individual—is responsible for this 'health literacy' is central to a new World Health Organisation report. Results of a randomised trial in people with low back pain who used a spinal cord stimulator were published recently, and the researchers are surprised by what they found. Hosts: Dr Norman Swan and Tegan Taylor