Cars batteries are a good match with wind power because they mostly charge at night, when people are sleeping, and wind tends to peak at night.

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Though seeing a newborn turtle make its way to the ocean is unlikely ('They mostly hatch at night, ' says Pakdin), swimmers may see a full-grown green turtle travel across the seabed.

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The thought ten years ago was that they would mostly be charged at night, filling in the valley of low off-peak demand, and thus allowing more kilowatt-hours to flow across the same infrastructure.

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They are mostly diurnal - sleeping at night and active during the day.

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My headlight is off, partly to save batteries, mostly to savor the surreal experience of climbing at night.

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Once a rare break from restrictive rules governing the behaviour of rural young women who were not allowed to sing aloud or go out at night, except during the Chuseok Thanksgiving celebration, the ritual is mostly preserved today by middle-aged women in cities and taught as part of the music curriculum of elementary schools.

UNESCO: Culture