Ten cities in Mexico have registered record-high temperatures, including the capital, authorities said on Friday, amid a searing heat wave that has prompted blackouts nationwide and pushed the power grid to the brink. In the normally temperate high-altitude capital of Mexico City, North America’s largest metropolis, thermometers on Thursday peaked at 34.3 degrees Celsius (93.7 degrees Fahrenheit), a tenth of a degree higher than the record hit just a month earlier. Neighboring Puebla broke its... Read this story