US seeks to revive nuclear deal with Iran, says ready for talks; Madras HC notice to Centre, SII after Covishield trial candidate alleges side effects; Bengal court summons Amit Shah in defamation case filed by TMC's Abhishek Banerjeel; Samyukt Kisan Morcha to celebrate Feb 23 as Pagdi Sambhal Day, remembering Bhagat Singh's uncle Ajit Singh; BJP youth leader Pamela Goswami arrested in Kolkata over possession of '100 gms of cocaine' and more...