Science ne kitni bhi tarakki kar li ho, par aaj bhi brahamand (universe) aur hamari dharti par aisi kai cheezein hain jo scientists ke liye ek bada sir-dard bani hui hain. Aise hi…………………… 8 bade unsuljhe scientific facts (rahasya) niche diye gaye hain jinhe aaj tak koi solve nahi kar paya: 1. Dark Matter aur…