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A child gently holds a little frog on his hands.

Why do almost all vertebrates have tails, but not apes and frogs?

Frogs and apes - including humans - do in fact have tails, argue our readers, and they are more useful than we realise

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A diver catches an octopus underwater

Why do humans pat animals on the head?

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2FERAXY Crowded groups of people crossing the street at Times Square during rush hour

How and when did the North American accent develop? (part 3)

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Open dishwasher with clean utensils in it; Shutterstock ID 218515030; purchase_order: -; job: -; client: -; other: -

Is there a correct way to fill a dishwasher? (part 3)

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2J9HJCG Smiling woman wearing towel spraying deodorant on body at home

This week鈥檚 new questions

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Someone throwing rubbish in bin. rubbish bin. Trash.

Is it more sustainable to flush a tissue or put it in the bin?

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2DHCKHY High angle view of smiling boy with gap toothed in park

Why is teething so painful for babies but not growth of second teeth?

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experienced hand of the old music teacher helps the child pupil; Shutterstock ID 379622230; purchase_order: -; job: -; client: -; other: -

Why is the left hand used for intricate violin fingerwork? (Part 3)

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Four cheerful female friends having fun on summer road trip

This week鈥檚 new questions

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iss067e189024 (July 16, 2022) --- The sun's rays begin to illuminate the Earth's atmosphere as the International Space Station flew into an orbital sunrise 261 miles above Texas. iss067e189024 NASA ID: iss067e189024 iss067e189024 (July 16, 2022) --- The sun's rays begin to illuminate the Earth's atmosphere as the International Space Station flew into an orbital sunrise 261 miles above Texas. Date Created:2022-07-16 Center:JSC

When was the first sunrise on Earth?

This is a question of how we define 鈥淓arth鈥�, say our readers, but we also need to consider when light from the young sun could have pierced Earth鈥檚 atmosphere

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Why do cats wash themselves, while dogs don鈥檛?

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Will the planets of our solar system ever line up in a row? (Part 2)

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This week鈥檚 new questions

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Could you make a machine that 鈥渇lew鈥� like Thor鈥檚 hammer in the comics?

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