The Founding Fathers who gathered in Philadelphia to adopt the Declaration of Independence on July 4, 1776 picked a nice day ...

In the atmospheric layer above it, about 10 to 30 miles up, is the stratospheric polar vortex, where every winter a sunlight-starved Arctic spins up a mass of cold air that, ultimately, dissipates ...

In November 1965 a Von Karman vortex street occurred at the Ferrybridge 3 coal-fired power station in West Yorkshire, England. There was a group of eight cooling towers, each over 300 feet tall.