In the world of science news this week, major supermarkets in the UK are removing their best before dates after data reveals just how much they sway our decisions to chuck food away. Plus, we dive into some physics to understand what influences how fast the Earth spins and how this fluctuates, the virtual robotic surgery techniques which helped separate Siamese twins in Brazil, and how gestures can make video meetings less fatiguing and more engaging. Like this podcast? Please help us by supporting the Naked Scientists