This week on Dear Science, Beth and Milly talk to Allan Blackman about all things cutting-edge. New research reveals that too much of a good thing can be bad, with scientists proving that oxygen in high amounts can cause cell damage. A new discovery in the world of insulin has shown that the medicine used to treat type one diabetes could be made even more effective, and finally, scientists edge closer to a new room temperature superconductor - however not without some doubts.