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Runner man with sports running knee injury. Hands holding knee with painful

Why is pain painful, when it’s just a nerve impulse like many others?

Pain needs to hurt in order to change our behaviour, say our readers, but it really is all in the mind

healthy toes close up with a human foot with clean nail; Shutterstock ID 2126317208; purchase_order: -; job: -; client: -; other: -

How did prehistoric people cut their toenails? (Part 2)

Hand of man inserting a power cord into an electric car for charging ecofriendly vehicle on green landscape

This week’s new questions

"Idyllic Waterfall - Source de la Loue, France."

How and where was water first created?

Laughing out loud. Funny animal meme image of happy animals having fun. Hilarious wildlife picture of two beautiful friendly grey seals playing around and apparently joking in the sand.; Shutterstock ID 1270830436; purchase_order: -; job: -; client: -; other: -

Do any other animals have a sense of humour?

A senior black couple playing outdoors with their two dachshunds

Why do I love my dog when there are no evolutionary benefits? (Part 2)

Saltwater crocodile (Crocodylus porosus) swimming at water surface, split-level, New Guinea, Indo-pacific

This week’s new questions

MTETTE A children's playground in Paris, France

What makes the slipperiness of slides vary so much from day to day?

B43AH9 Copper saucepan with steam

Taking near-boiling water off the hob immediately creates steam. Why?

E6BAMW Green peas

This week’s new questions

Why are peas green when they grow encased within a dark pod? And does anything actually cure hiccups?

Why are there more consonants than vowels in alphabetic languages?

Why do wagtails constantly wag their tails?

This week’s new questions

Does belief confer an evolutionary advantage?