女生小视频

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Male nose close up bottom view - hair in the nostrils; Shutterstock ID 1895123341; purchase_order: -; job: -; client: -; other: -

I see why we have two eyes and ears 鈥� but why two nostrils? (Part 2)

It is essential for both the hunter and the hunted to know which direction a smell is coming from, says one reader. Our sense of smell is better than you might think 鈥� so think twice before farting in an elevator

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2WA289F The supermoon rise at the Nature Discovery Sanctuary in Winkler, Manitoba, Canada.

This week鈥檚 new questions

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Guess who brought back Agatha Christie as an AI clone

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Tom Gauld on a new and unusual perspective on the world

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Twisteddoodles on a case of mistaken location

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Ami Vitale - Pandamonium A panda keeper does a health check on the cub of giant panda Xi Mei at the Wolong Nature Reserve managed by the China Conservation and Research Center for the Giant Panda in Sichuan province, China October 31, 2015. (Photo by Ami Vitale)

Environment

Powerful images capture the fragility and resilience of our planet

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Man mowing downhill Description Man wearing white overalls and back to front baseball cap trying to mow down steep verge outside building. Memphis, USA

Mathematics

The handy piece of maths that can help with organising chores

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Comment

The egg-drop experiment… but make it peer review

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HE21RH Chef decorating a meal made of fish

When did hominids start decorating food and do other species do it?

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Lola the Cat, behind a window, London

How would our tech development have gone if glass wasn鈥檛 transparent?

Readers point to other clear materials that could be used instead of glass, from plastics to crystals, though they bring new challenges

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This week鈥檚 new questions

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Tom Gauld on giving credit where it’s due

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Life

Remarkable photos highlight the haunting resilience of nature

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Twisteddoodles on a cunning new strategy to avoid extinction

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