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Leopard gecko lizards on the rock, cute lizards that are easy to care for, eublepharis macularius, animal closeup; Shutterstock ID 2551815383; purchase_order: -; job: -; client: -; other: -

Which animals can recognise individual people? Part 3

One reader explains how a lamb鈥檚 ability to recognise her led to a happy reunion

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3BHN5M7 A woman holds a sign that reads Greed is not a virtue during a protest across the street from Florida Congresswoman Maria Elvira Salazar's Office.

This week鈥檚 new questions

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Where did I put it? Loss of vital crypto key voids election

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Twisteddoodles on an unexpected Martian discovery

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Tom Gauld on the travails of an earthworm

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Around two hundred of people ran in Santa Claus costumes during the Santa Run event organized by the foundation 'Rotary Santa Run' in the Dutch city of Breda. The event raised at least 8.000EUR for two local charities. On December 18th, 0222. (Photo by Romy Arroyo Fernandez/NurPhoto via Getty Images)

91色情片

The quick and easy ways to stay fit this holiday season

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Neon Welcome signboard retro style, Toilet sign with boy, girl figure. Glowing inscription on dark red brick background. Suitable for night outdoor banner, advertisement, shop, night club. 3D render.; Shutterstock ID 2265283835; purchase_order: -; job: -; client: -; other:

Do you wake up needing to pee, or need to pee because you鈥檝e woken up?

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Child's Spinning Top Toy; Shutterstock ID 365058569; purchase_order: -; job: -; client: -; other:

What would happen if a spinning disc neared the speed of light? Part 2

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Leopard gecko lizards on the rock, cute lizards that are easy to care for, eublepharis macularius, animal closeup; Shutterstock ID 2551815383; purchase_order: -; job: -; client: -; other: -

Which animals can recognise individual people? Part 2

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Planet in water - Moon. Science fiction art. Solar system. Elements of this image furnished by NASA; Shutterstock ID 579784837; purchase_order: -; job: -; client: -; other:

This week鈥檚 new questions

How long would a race need to be for a human to beat a cheetah? And if all the water on Earth鈥檚 surface, and in the air, were put into a ball, how large would the sphere be?

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The science of swimming trunks 鈥� including tightness analysis

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Life

‘Horrific and beautiful’ whale rescue image wins photography prize

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Tom Gauld on plans for an exciting new technology

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Twisteddoodles: Something in the lab isn’t working…

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