Thank you! Yes, I love the overturning demo, too! I’ve started to use cool packs instead of dyed ice cubes to avoid planting the seed for the misconception that dense water in the global overturning circulation, or in the case of this experiment the Nordic Seas-Denmark Strait-North Atlantic part of it, is fresh melt water. But not sure how big that danger actually is; I just found myself pointing it out so much that I decided to go for the cool pack and then instead ask “if we used ice cubes instead, what would happen and how does that relate to the real ocean?”