As part of the selection process, he posed a fundamental mathematics question, typically taught in Class 5: "If a car travels the first 60 km at 30 km/h and the next 60 km at 60 km/h, what is its ...

If they both completely melted, they would raise sea level by an estimated 67.4 meters (223 feet). Long-term satellite data indicate that through most of the twentieth century, the ice sheets made ...