杏吧原创

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PE5P96 Close up of two purple socks with yellow lemon detail, pegged to a washing line with two yellow clothes pegs, shot from below against a clear blue sky

Why do plastic clothes pegs fade and get brittle in the sun?

One reader draws on his chemistry days to explain why some types of plastic become fragile after exposure to ultraviolet light

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Outdoor Backpack with Water Bottle on the back of a girl, School, isolated Green background Nature. Education concept; Shutterstock ID 2038295597; purchase_order: -; job: -; client: -; other: -

Is it more efficient to cart water in a bottle or my stomach? Part 2

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Archaeological excavations. Human remains (bones, skeleton and skull) in the ground, with many little found artefacts in the tomb. Real digger process. Outdoors, copy space, close up. ; Shutterstock ID 1256987506; purchase_order: -; job: -; client: -; other: -

This week鈥檚 new questions

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RAT1RK Experiment with red laser in optics lab

How do two photons become quantum entangled 鈥� and can I do it at home?

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AX21BH Close-up shot, goosebumps

Why does some music give us goosebumps?

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Close-up of construction bubble level.

When a spirit level is flat, what does that mean relative to Earth?

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Hand of male holding soil in the hands for planting. Expert hand of farmer checking soil health before growth a seed of vegetable or plant seedling. Gardening technical, Agriculture concept.; Shutterstock ID 2252590625; purchase_order: -; job: -; client: -; other: -

This week鈥檚 new questions

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Why is tea more likely than coffee to leave a stain in a mug?

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Cosmonaut in a futuristic dystopian city . Sci fi and virtual reality concept . This is a 3d render illustration . ; Shutterstock ID 2230705453; purchase_order: -; job: -; client: -; other: -

What happens to our electronic cloud records when we die? Part 2

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In late summer sunflower ripened on the farm field; Shutterstock ID 1883406451; purchase_order: -; job: -; client: -; other: -

Plants wither away when neglected. Can they also feel pain?

The simple answer is no, say our readers, but plants can react to environmental stimuli in ways that serve a similar purpose to the human pain response

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This week鈥檚 new questions

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Is it more efficient to carry water in a bottle or in my stomach?

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Did the running skills of our species help us outcompete Neanderthals?

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This week鈥檚 new questions

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