Learn the facts and numbers behind the construction of One World Trade Center in Lower Manhattan. | HISTORY

NASA’s DC-8 aircraft flies low over Los Angeles, as scientists onboard collect data on urban emission and atmospheric chemical reactions. The project will continue its investigations flying at low altitudes over Chicago, New York, and Toronto to measure pollution sources and their effects on climate and air quality. If you find yourself in one of these urban metropoles this summer, keep an eye out for the largest flying science laboratory in the world! ✈️ 🔗: https://go.nasa.gov/43xu8GS | NASA's