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2EXM9NK Hand Knuckle Finger Joint Crack. Fingers Snap

How can popped knuckles be so exceptionally loud?

Our readers explain the chemistry behind popping knuckles 鈥� but point out they aren't all that loud when compared with, say, a snapping shrimp

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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

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In this Voyager 2 image of Saturn, obtained Aug. 11, 1981, from a range of 14.7 million kilometers (9.1 million miles), north is at the upper right edge of the disc. Seen above the planet are the satellites Dione (right) and Enceladus. This false-color print shows a green spot at the south edge of a yellow band; in true color, the spot would appear brown and the band white. A bright yellow spot slightly above and to the left in this image moves eastward relative to the green spot at a rate that allows it to pass the green feature in about 50 days. The convective clouds that appear between the two spots are typical of the region. Here, the smallest visible structures measure about 270 kilometers (170 miles). The Voyager project is managed for NASA by the Jet Propulsion Laboratory, Pasadena, Calif. https://www.jpl.nasa.gov/images/pia01959-voyager-2-image-of-saturn

This week鈥檚 new questions

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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 parking car can get into?

Our readers have lots of answers for this one, with some invoking Pythagoras and others advocating manually lifting a car into place to ensure the tightest possible fit

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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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When sea swimming, is it better to enter quickly or to take your time?

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What is the minimum number of people needed for a Martian settlement?

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