Oil prices slide on hopes of US-Iran peace deal • Three enjoyable ways to slow your brain's ageing • Why Eurovision's fallout over Israel may change the competition forever • Portrait looted by Nazis found in home of Dutch SS leader's descendants • Tourist hotspot at 'end of the world' denies causing hantavirus outbreak • Estevao dazzles as Chelsea humble 10-man Barca • Philippines urges Myanmar to grant ASEAN envoy access to Aung San Suu Kyi • India's fiercest female politician faces a fight for survival