> For better sinking ice, mix deuterium and oxygen-18. One of the videos linked by other comments mentioned that they spend $1000 on a tiny amount of O18 to se

> For better sinking ice, mix deuterium and oxygen-18. One of the videos linked by other comments mentioned that they spend $1000 on a tiny amount of O18 to see if it would also taste sweet. Ice cubes made from that seem to be the kind of party trick best reserved for celebrating your first billion.