The authorities in Bangladesh have issued another heatwave alert for three more days beginning Sunday as the South Asian country is facing its longest heatwave in 75 years. Bangladesh reported the season’s highest temperature at 42.7 degrees Celcius on Friday in the south-western district of Chuadanga. Dhaka’s maximum temperature was 38.2 degrees that day, according to meteorological data. The blistering heat has forced the government to shut schools for a week, with hospitals preparing to receive higher numbers of patients with heat-related ailments. The heatwave reached a 29th day on Sunday,…