Shakuntala Devi will premiere on Amazon Prime on the 31st of July. The film is directed by Anu Menon and stars Vidya Balan, Amit Sadh and Sanya Malhotra (whom we saw in Badhaai Ho). Director Menon also helmed Waiting (availabale on Netflix currently) starring Naseeruddin Shah and Kalki Koechlin. Honestly, Waiting was no great shakes;