The shell of a water/glycerol gas marble (bubble) remains liquid and spherical even after 101 days, and it reacts as a liquid film when punctured. These human-made bubbles could be used to create stable foams. (credit: A. Roux et al., 2022) Blowing soap bubbles never fails to delight one's inner child, perhaps because they are intrinsically ephemeral, bursting after just a few minutes.