Pennie Latin meets the founder of Sci Sisters and the Crum Brown Chair of Chemistry at the University of Edinburgh, Professor Polly Arnold Polly's work focus's around two fundamental forms of waste. She spends her time as chemist lurking around the bottom end of the Periodic Table with elements like uranium and plutonium. This waste she is interested in is nuclear waste and primarily how will it behave as it decays in the future. The other waste she focuses her attention to is what she sees as the waste of talented women who, for a variety of reasons, leave their careers in STEM. To address this she started SciSisters, a network for women in STEM to provide a platform for promoting their areas of expertise and at the same time providing support for women working in a field with a strong gender imbalance.