The polar vortex of ultra-cold air usually spins around the North Pole, but it sometimes plunges south into the U.S., Europe and Asia. Some experts say such cold air outbreaks are happening more ...
Komatsu’s 102-ton PC900LC-11 excavator is a large workhorse designed for hefty production. Take a tour of the 543-horsepower earthmover and see it in action.