The document discusses 10 obscure uses of mercury that employ its unique properties as a liquid metal at room temperature that conducts electricity and forms amalgams. These uses include: 1) A mercury fountain designed by Alexander Calder that uses mercury's liquid properties; 2) A liquid mirror telescope that uses mercury's reflective surface; 3) A tennis elbow shock absorber that uses mercury's ability to neutralize vibrations; and 4) Separation of lithium isotopes using mercury's ability to readily form amalgams with lithium-6.