[{"from": "human", "value": "Provide a brief overview of this molecule. [He]"}, {"from": "gpt", "value": "The molecule is a colorless odorless gas. It is lighter than air. It is nonflammable and is only slightly soluble in water. It is chemically inert. When shipped as a liquid it is very cold and will solidify all other gases. Contact with the liquid will cause severe frostbite. Liquid helium is used in cryogenic research and as a nuclear reactor coolant."}]