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Whether it’s water flowing across a condenser plate in an industrial plant, or air whooshing through heating and cooling ducts, the flow of fluid across flat surfaces is a phenomenon at the heart of many of the processes of modern life.

Powerful thunderstorms moving through eastern Texas and western Louisiana spawned several tornadoes, including some that caused major damage.

Researchers from Lund University and the University of Tromsø have examined the immune system strength of the Svalbard rock ptarmigan in the Arctic.

The average picker now experiences 21 days each year when the daily heat index — a mix of air temperature and humidity — would exceed workplace safety standards.

Thanks to a wet summer, water levels rose in this ephemeral lake in Western Australia.