A talk on ‘Archaeological and numismatic evidence of trade in the Indian Ocean: Discovery of a second century BCE shipwreck at Godavaya, Sri Lanka’ will be given by Dr. Osmond Bopearchchi, director of research, French National Centre for Scientific Research, Paris on Aug 18 at C. P. Ramaswami Aiyar Foundation. At 1, Eldams Road, Alwarpet, 6.30 p.m.