91色情片

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dish wash interior with plates and glasses; Shutterstock ID 132556751; purchase_order: -; job: -; client: -; other: -

Why do plastic items stay wet for longer in the dishwasher?

Readers explain how heat conductivity and surface properties influence the rates at which materials dry after a wash cycle

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3BCKRT6 Open artificial model human body with lungs and heart

Why is the heart not in the centre of our body?

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2C0KN5C Funny husky dog in glasses lying on the grass in a summer park

This week鈥檚 new questions

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Comment

Jewellery that monitors movement? No, we can’t anticipate any problems

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Tom Gauld on a classic thought experiment

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TwistedDoodles on scientific protocols

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A small silver car driving round the sharp bends of a country road in the Peak District, England. Low sunlight casting shadows on the s shaped curves.

Should I accelerate when driving over hills or keep to a steady speed?

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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 waiting in midair? Part 2

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circa 1950: A chubby man sees himself a few stone lighter in a distorting mirror made at the Pittsburgh Plate Glass Co. (Photo by Douglas/Three Lions/Getty Images)

This week鈥檚 new questions

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Anthropic AI goes rogue when trying to run a vending machine

Feedback watches with raised eyebrows as Anthropic's AI Claude is given the job of running the company vending machine, and goes a little off the rails

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Humans

Triumphant images of women who climbed to new heights

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Tom Gauld on a missing prototype

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Twisteddoodles on a mysterious scientific delivery

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Mind

What characterises a dark empath? The science behind the buzzword

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