Our Puranas and other Mahagranthas like Ramayana & the Mahabharata contains numerous examples of curses(saap)(& boons ofcourse) and how their effectiveness shape future events.
In Mahabharata itself we find many instances viz;Karna being cursed by his Guru Parasurama,Sri Krishna cursing Aswatthama ,Sri Krishna in turn getting cursed by Gandhari.And, all those curses fructified.
But that was Dwapara.What about Kali Yuga?
Are curses equally effective in this age as well?