US President Donald Trump has ordered the Pentagon to “substantially reduce” joint military exercises with South Korea, given his “very good relationship with North Korean leader Kim Jong Un.” Also, campaigns for this year’s presidential election in Brazil have begun, with incumbent Luiz Inácio Lula da Silva running against Flavio Bolsonaro, son of his former rival. And, Swiss rivers and lakes are reaching near-record temperatures, risking disruptions to the electricity supply by making hydropower less efficient and by making it impossible to cool nuclear plants. Plus, the Olympic stadium in Athens gets its first deep cleaning in over a century.