voluntary

Dear scholar, As-Salamu `alaykum. Is it OK for me as a Muslim living in the West to participate in volunteer projects with non-Muslims? Jazakum Allah khayran.

As-Salamu `Alykum. Are there certain days to fast in the week as a Sunnah or is it a bid`ah (innovation in religion)? Some books say it is Sunnah to fast Mondays, Thursdays, and 13th, 14th, and 15th of each months. Does that mean those days are special in the week and month or holier? Could you explain this please? Jazakum Allah Khayran.