Health

Expert explains how shift work affects your sleep

All life on Earth is affected by the day-night cycle resulting from the planet's rotation. In line with this, humans are naturally awake during daylight hours, and sleep at night when it is dark. Being awake during the day ...

Ophthalmology

Lab-grown retinas explain why people see colors dogs can't

With human retinas grown in a petri dish, researchers discovered how an offshoot of vitamin A generates the specialized cells that enable people to see millions of colors, an ability that dogs, cats, and other mammals do ...

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