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DDPTRF Hot air balloons at Balloon Fiesta in balloon fiesta Albuquerque, New Mexico, U.S.

Is it true that fresh air heats up faster than stale air? If so, why?

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D73X1R An colorful adult midnight snapper swims over the reef

How do fish recognise others of their own species? Part 2

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PF9N2P Honeybee stick on a window

Are flies following a strategy when they keep hitting a window? Part 2

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This week’s new questions

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Why do fictional geologists keep getting killed off in movies?

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R82JR5 cyberspace - open program source code concept

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Why open-source software can be both good and bad

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D73X1R An colorful adult midnight snapper swims over the reef

How do fish recognise others of their own species?

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Two scientists use a massive, illuminated periodic table of elements as they discuss the element holmium in the Lawrence Hall of Science at the University of California, Berkeley. (Photo by ?? Ted Streshinsky/CORBIS/Corbis via Getty Images)

How many known elements could we delete without ill effect? Part 2

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H99WWH Low Angled portrait of a German Shorthaired Pointer dog.

This week’s new questions

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Can you guess the origin of 7 tiny species on a fictional archipelago?

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Spectators shield themselves from the heat with a leaflet ahead of the 2026 World Cup football tournament round of 16 match between Paraguay and France at Philadelphia Stadium in Philadelphia on July 4, 2026. (Photo by MAURO PIMENTEL / AFP via Getty Images)

Environment

It is vital we understand heat and humidity’s differing effects on us

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A surprisingly detailed look at the physics of a lugworm’s poop

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