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Loosen bolt in daylight close up.; Shutterstock ID 1195047430; purchase_order: -; job: -; client: -; other: -

Why do loose screws only get looser, not the other way round? (part 2)

Our readers provide yet more evidence that screws don’t always get looser

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MXMH8X colorful water drop splash

This week’s new questions

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Sore Tooth Decay. Dental Care And Pain; Shutterstock ID 1895847487; purchase_order: -; job: -; client: -; other: -

What is the point in having nerve endings in our teeth?

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In need of a buzzy new cosmetic? You could always brew one up

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Confit pork with thyme

Humans

How to use the science of fat to make delicious, confit food

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Tom Gauld on the palchemists

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Twisteddoodles puts a ring on it

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A red-eyed tree frog in its Costa Rican rainforest home

Earth

Some of the stunning winners of the Sony World Photography Awards

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Big Microplastic Survey. Layal?s Citizen Science Maker for 18th Feb. Photos from Layla's survey.

Environment

Help to create a global map of ocean microplastic pollution

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2CTJXXG Male fitness instructor with women lifting weights while standing in yard

Doing strenuous exercise, it helps to shout the number of reps. Why?

Calling out the number of repetitions when doing exercise such as a weightlifting could have numerous benefits, say our readers - both physical and psychological

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Would a tug of war be possible over 42 km between France and England?

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How much of my body from 40 years ago is part of me today? (part 2)

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This week’s new questions

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The strange story of the nuclear submarine and the super glue repair

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