i do yoga on tuesdays.
[{"role": "system", "content": "Tuesday is a day of the week occurring after Monday and before Wednesday. According to international standard ISO 8601, it is the second day of the week. According to some commonly used calendars, however, especially in the United States, it is the third day of the week. The English name is derived from Old English \"Tiwesd\u00e6g\" and Middle English \"Tewesday,\" meaning \"T\u012bw's Day\", the day of Tiw or T\u00fdr, the god of single combat, victory and heroic glory in Norse mythology. Tiw was equated with Mars in the interpretatio germanica, and the name of the day is a translation of Latin \"dies Martis\". The name \"Tuesday\" derives from the Old English \"Tiwesd\u00e6g\" and literally means \"Tiw's Day\". Tiw is the Old English form of the Proto-Germanic god \"*T\u00eewaz\", or T\u00fdr in Old Norse. \"*T\u00eewaz\" derives from the Proto-Indo-European base \"*dei-\", \"*dey\u0101-\", \"*d\u012bdy\u0101-\", meaning 'to shine', whence comes also such words as \"deity\". The Latin name \"dies Martis\" (\"day of Mars\") is equivalent to the Greek \u1f21\u03bc\u03ad\u03c1\u03b1 \u1f0c\u03c1\u03b5\u03c9\u03c2. In most languages with Latin origins (Italian, French, Spanish, Catalan, Romanian, Galician, Sardinian, Corsican, but not Portuguese), the day is named after Mars, the Ancient Greek Ares \u1f0c\u03c1\u03b7\u03c2 . In some Slavic languages the word Tuesday originated from Old Church Slavonic word \"\u0432\u044a\u0442\u043e\u0440\u044a\" meaning \"\"the second\"\".\n"}, {"role": "assistant", "content": "many people think of tuesday as the third day of the week but according to international standard ISO, it is the second day of the week!"}, {"role": "user", "content": "So according to the International standard ISO, they week starts on Monday?"}, {"role": "assistant", "content": "yes. also the name tuesday derives from the old english \"tiwesd\u00e6g\" and that means \"tiw's day\""}, {"role": "user", "content": "Do all the names of the days of the week derive from old english?"}, {"role": "assistant", "content": "im not sure about other days  but youre probably wondering what tiw is, tiws day was the day of tiw or tyr. tiw is the god of single combat, victory and heoric glory in norse mythology."}, {"role": "user", "content": "Was tyr also a god in norse mythology?"}, {"role": "assistant", "content": "yes tyr is tiw. some things just have multiple names if that makes sense. but tuesday has other originations according to other cultures, in some slavic language tuesday originatted from old chuch slavonic word \"\u0432\u044a\u0442\u043e\u0440\u044a\" which means the second. it probably stands for second day of the week "}, {"role": "user", "content": "Is old chuch slavonic a language where old english rooted from?"}]