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2R067KD The Great Sphinx is the oldest known monumental sculpture in Egypt. It was built more than 4,500 years ago to guard the pyramid of Khafre at Giza.

How long will it be until the pyramids in Egypt weather away?

With one estimate suggesting the erosion of the pyramids is approximately 0.1 centimetres per decade, this will take some time, say our readers 鈥� but what about a meteor strike?

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B1PP5G Spiral Galaxy M74 i. Image shot 2008. Exact date unknown.

What makes galaxies spin in a certain direction? Part two

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GUILIN, CHINA - OCTOBER 16: Juri Hollmann of Germany and Movistar Team leads the peloton during the 4th Gree-Tour of Guangxi 2023, Stage 5 a 209.6km stage from Liuzhou to Guilin / #UCIWT / on October 16, 2023 in Guilin, China. (Photo by Tim de Waele/Getty Images)

This week鈥檚 new questions

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Brachycybe lecontii (F Andrognathidae) millipede

Is there a limit to how small an adult arthropod can be? If so, why?

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Beautiful sky and blue ocean; Shutterstock ID 122089855; purchase_order: -; job: -; client: -; other: -

Would whisking cold water up from the ocean depths help with warming?

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B095JB Swarm of gnats (Nematocera), Bavaria, Germany, Europe

Are gnats attracted to eyeballs, or do we just notice these ones most?

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champagne spoon

This week鈥檚 new questions

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Split view of a pod of sperm whales in a social group showing the sky and below the waterline, north western Mauritius.; Shutterstock ID 742662229; purchase_order: -; job: -; client: -; other: -

Why don鈥檛 marine mammals like whales get 鈥榯he bends鈥�?

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The Supermoon rises over houses in Olvera, in the southern Spanish province of Cadiz, July 12, 2014. Occurring when a full moon or new moon coincides with the closest approach the moon makes to the Earth, the Supermoon results in a larger-than-usual appearance of the lunar disk. REUTERS/Jon Nazca (SPAIN - Tags: SOCIETY CITYSCAPE TPX IMAGES OF THE DAY) - GM1EA7D0FC401

When was it realised that moonlight is reflected sunlight? Part 2

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How do dogs recognise that another animal is also a dog? Part 3

One reader is clear that chihuahuas don't pass the dog sniff test for their labradors, while a golden retriever is less discerning

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This week鈥檚 new questions

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Why do fallen trees grow stems vertically from a horizontal trunk?

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What makes galaxies spin in a certain direction?

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Why can鈥檛 we conjure up smell and touch in our heads? Part 3

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