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A small silver car driving round the sharp bends of a country road in the Peak District, England. Low sunlight casting shadows on the s shaped curves.

Should I accelerate when driving over hills or keep to a steady speed?

Our readers agree that it is generally most fuel-efficient to maintain a constant speed while driving up and down hills 鈥� but there are other factors to consider too

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Illuminated globe from inside spinning, colourful earth globe ; Shutterstock ID 555407242; purchase_order: -; job: -; client: -; other: -

Given Earth rotates, can I travel by waiting in midair? Part 2

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circa 1950: A chubby man sees himself a few stone lighter in a distorting mirror made at the Pittsburgh Plate Glass Co. (Photo by Douglas/Three Lions/Getty Images)

This week鈥檚 new questions

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Exposures of clocks, watches, Time-Pieces of various kinds and periods. Photograph ?? Santosh Verma

Why are there 60 seconds in a minute and 60 minutes in an hour?

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2XH91PX Common redshank (Tringa totanus) in breeding plumage perched on one leg on wooden fence pole along meadow in summer

Why do so many birds like standing on one leg?

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MKC0KM white cat climbing on a tree

This week鈥檚 new questions

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Illuminated globe from inside spinning, colourful earth globe ; Shutterstock ID 555407242; purchase_order: -; job: -; client: -; other: -

Given Earth rotates, can I travel by going straight up and waiting?

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

Does a full moon reflect enough sunlight to drive photosynthesis?

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This week鈥檚 new questions

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H911D3 A metal hand dryer mounted on a colourful tiled wall.

What鈥檚 the best way to dry my hands efficiently with a hot air blower?

Our readers have detailed and informative advice to offer here 鈥� although not all agree on whether a hot air dryer should be used in the first place

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Why do low-alcohol beers taste better than low-alcohol wines? Part 2

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This week鈥檚 new questions

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Why do low-alcohol beers taste better than low-alcohol wines?

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Does car tyre pressure affect speedometer readings? Part 2

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