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Cocaine (from French: cocaïne, from Spanish: coca, ultimately from Quechua: kúka)[14] is a tropane alkaloid that acts as a central nervous system (CNS) stimulant. As an extract, it is mainly used recreationally, and often illegally for its euphoric and rewarding effects. It is also used in medicine by Indigenous South Americans for various ...

Esperanto ( / ˌɛspəˈrɑːntoʊ /, /- æntoʊ /) [7] [8] is the world's most widely spoken constructed international auxiliary language. Created by the Warsaw -based ophthalmologist L. L. Zamenhof in 1887, it is intended to be a universal second language for international communication, or "the international language" ( la Lingvo Internacia ).

Methane (US: /ˈmɛθeɪn/ METH-ayn, UK: /ˈmiːθeɪn/ MEE-thayn) is a chemical compound with the chemical formula CH4 (one carbon atom bonded to four hydrogen atoms). It is a group-14 hydride, the simplest alkane, and the main constituent of natural gas. The relative abundance of methane on Earth makes it an economically attractive fuel ...