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Four cheerful female friends having fun on summer road trip

Which is more efficient when cooling a car, A/C or windows? (Part 2)

One reader recalls a trip to New Orleans - and an experiment with electrically operated windows

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Mandatory Credit: Photo by Dasha Petrenko/imageBROKER/Shutterstock (13916956bb) Gym woman doing push up exercises with dumbbells. Strong brunette female doing crossfit workout Various 23afbhbada

This week鈥檚 new questions

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The surface of Venus, the irregularities of the planet. Elements of this image furnished by NASA. High quality photo; Shutterstock ID 2157724597; purchase_order: -; job: -; client: -; other: -

Would it be theoretically possible to build a habitable dome on Venus?

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A close up of an Old Indian Square coin or Currency ( Written 20th Part of Rupee, 5 Paise, 1968 in Hindi Language ) ; Shutterstock ID 1555549076; purchase_order: -; job: -; client: -; other: -

Why does a ‘square’ coin sliding down a slope soon fall over?

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Eucalyptus Wandoo or White Gum, endemic to the Southwest of Western Australia. A gum tree native to this area of the WA Wheatbelt.

This week鈥檚 new questions

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Big dog meets small dog; Shutterstock ID 2045462630; purchase_order: -; job: -; client: -; other: -

How do dogs recognise other dogs when there are so many canine types?

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

Spraying a can of deodorant, why does it get cold when it runs out?

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A diver catches an octopus underwater

Why do humans pat animals on the head? (continued)

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B1PP5G Spiral Galaxy M74 i. Image shot 2008. Exact date unknown.

This week鈥檚 new questions

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Lesvos, Greece - February 27, 2016: Greek man and woman, children, volunteers and refugees are standing hand in hand to make a message to the world, 'SafePassage'

If we all lined up with our arms touching, where would this circle be?

Our readers get out their calculators and discover this circle of humans would wrap around the Earth several times - provided some people don鈥檛 mind being in the oceans

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Given the impact of cats, why don鈥檛 we domesticate more rats as pets?

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Why can鈥檛 we conjure up smell and touch in our heads? (part 2)

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This week鈥檚 new questions

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Earth was a hothouse 201 million years ago. How did it recover?

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