Asteroid water, box jellyfish stings, and pints of science

This week, Chris looks at how measuring elements in samples brought back from asteroids could reveal where the Earth's water came from; Stu asks Greg Neely from the University of Sydney about his research into how box jellyfish cause pain, and how that could lead to an antidote; and Claire talks to Elodie Camprasse about scientists speaking about their work in pubs around the country for Pint of Science, pintofscience.com.au