91色情片

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Exposures of clocks, watches, Time-Pieces of various kinds and periods. Photograph ?? Santosh Verma

Why are there 60 seconds in a minute and 60 minutes in an hour?

Our readers delve back millennia to answer this one, looking at the ancient Sumerians, the Babylonians and the Egyptians to explain the origins of seconds and minutes

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2XH91PX Common redshank (Tringa totanus) in breeding plumage perched on one leg on wooden fence pole along meadow in summer

Why do so many birds like standing on one leg?

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MKC0KM white cat climbing on a tree

This week鈥檚 new questions

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Encounter Within One Second ? Zhang Yanguang This image captures the International Space Station (ISS) transiting across the solar disc. The solar background was captured separately with double-stacked etalon[an optical filter that isolates specific wavelengths, used to observe solar details], and reveals high-contrast chromospheric details. The imaging sequences were strategically combined during post-processing to preserve both the spacecraft?s crisp silhouette and the Sun?s intricate surface features. Taken with a Takahashi Teegul 60 telescope, Coronado SolarMax 60 double stacked, Vixen polaris mount, Player One Astronomy Neptune-M camera, 500 mm f/8.3, 0.3-millisecond exposure Location: Xiamen, Fujian, China, 24 January 2025

Space

Otherworldly space images from a major photography competition

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Pink Floppy Disc and The Bitles: Embracing the future of AI music

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My Octopus Mother by Kat Zhou

Life

Stunningly intimate octopus image wins aquatic photography prize

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Tom Gauld on the lifecycle of scientific papers

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Twisteddoodles: Twenty generations of selective breeding later…

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Illuminated globe from inside spinning, colourful earth globe ; Shutterstock ID 555407242; purchase_order: -; job: -; client: -; other: -

Given Earth rotates, can I travel by going straight up and waiting?

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2WA289F The supermoon rise at the Nature Discovery Sanctuary in Winkler, Manitoba, Canada.

Does a full moon reflect enough sunlight to drive photosynthesis?

Yes, says a reader - and interesting research is going on into photosynthesis in low light conditions

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This week鈥檚 new questions

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Comment

Is this the raciest conference invite ever?

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Tom Gauld on ‘bring your child to work day’

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Twisteddoodles: If climate change was a genie

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