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Bird droppings on a car. (Photo by: Jeffrey Greenberg/Universal Images Group via Getty Images)

Why are bird droppings white, considering all they eat? (part 2)

According to one reader, the whiteness of bird droppings might not be due to uric acid after all

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A close up of a common housefly on a green flower.

This week’s new questions

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Why some people find it so hard to find food in the fridge

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Tom Gauld: ‘I’d like to make changes to our investment portfolio’

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Twisteddoodles detects a trip and fall

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FEATURE ONLY The grow hall at Nordic Harvest close to Copenhagen, where a 14 storey high system grows salad leaves in water under UV lights.

Technology

Futuristic farm may use 250 times less water than normal

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2D4B1M5 Sporty young woman tying the shoelaces before run or jog.Concept of sport and healthy lifestyle.

What is the best way to tie shoelaces?

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Does the expansion of the universe apply to atoms and objects like me?

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The impossibly low rainbow: The mystery continues

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We found this object a couple of weeks ago in the surf on Kilvickeon Beach on the south end of the Isle of Mull in Scotland. It was originally dark and got lighter as it dried out. It has a bit of an odd smell! Both sides which look very different. Taken a few days apart, tic-tac box for scale!

This week’s new questions

Can you help identify a strange blob found on a Scottish beach? And why hasn’t domestication caused cats to evolve as much as other domesticated animals?

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Space

How to use the Cassiopeia constellation to spot Andromeda and Pegasus

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Scientists have finally worked out the effects of consuming red wine

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Tom Gauld on the two ways to explain scientific research

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Twisteddoodles prepares to defend a thesis

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