TEHRAN, Iran (AP) — Melika Aghaei's fingers move slowly across the keys of the digital piano as she softly sings a children's song to the delight of the cafe's customers, while Mehdi Khakian takes orders for espressos and lattes. Located near the bustling Vanak Square in north Tehran, the "Downtism Cafe" stands out from other coffee shops in the affluent neighborhood for its unique staff.Read more on NewsOK.com