91色情片

Last Word

2F4D4YW Two American crows sitting on a bare branch communicating with each other.

This week鈥檚 new questions

How do crows develop such distinct and individual 鈥渧oices鈥�? One reader notes that they don鈥檛 hear the same variety in other bird species in their garden. And why do older people seem to experience time passing more quickly?

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FE11X8 Cyclist driving, at dusk, in a city street, with and without lights and safety clothing, bike safety, visibility at night

Which bicycle lights are safest and give the best visibility?

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2EXM9NK Hand Knuckle Finger Joint Crack. Fingers Snap

How can popped knuckles be so exceptionally loud?

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2JP8KPY Very tight parking in Italy with a small dented family car bumper to bumper squashed in next to two cars in a parking bay with only inches to move.

What is the shortest space a parked car can get out of? Part 2

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Asteroid impact event. Lateral sectioned view of an asteroid impact, similar to that which is thought to have caused the extinction of the dinosaurs around 65 million years ago. The impact took place at sea near the coast of the Yucatan Peninsula in Mexico, forming the Chicxulub crater (around 200 kilometres across). The impact threw trillions of tons of dust into the atmosphere and sent tsunamis (massive waves) around the globe, destroying coastal areas. Dust and water vapour in the atmosphere lowered global temperatures. Plant and then animal life began to die off. The dinosaurs never recovered, and mammals rose to become the dominant form of life.

This week鈥檚 new questions

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champagne spoon

Does putting a spoon in a bottle of champagne stop it losing its fizz?

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MGCGTA Two identical twins, sitting in cafe, wearing the same clothes, writing with both hands, simultaneously, London, England, UK

Why aren鈥檛 we equally capable with our left and right sides?

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ginger cat slumped over a branch stuck in a cherry tree; Shutterstock ID 1750273625; purchase_order: -; job: -; client: -; other: -

This week鈥檚 new questions

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Sound waves spectrum

As sound dissipates, what happens to this energy?

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Two seagulls above aircraft wing

Do winged animals ever suffer comparable mishaps to aircraft? Part two

Birds are often caught out by landings, say our readers, pointing to the wedge-tailed shearwater鈥檚 haphazard night-time landing technique

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This week鈥檚 new questions

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What is the shortest space a parking car can get into?

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Why don鈥檛 marine mammals like whales get ‘the bends’? Part 2

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This week鈥檚 new questions

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