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Imagine a future in which every home has an appliance that pulls all the water the household needs out of the air, even in dry or desert climates, using only the power of the sun.

That future may be around the corner, with the demonstration this week of a water harvester that uses only ambient sunlight to pull liters of water out of the air each day in conditions as low as 20 percent humidity, a level common in arid areas.

What is the volume of water in lakes on Earth? Using a mathematical analysis, researcher David Seekell, at Umeå University, and his American collaborators now suggest that the mean depth of lakes is 30 per cent lower than previously estimated. Shallower lakes implies less fresh water and has consequences for our understanding of climate change and the carbon cycle. The results have been published in Geophysical Research Letters.

Most if not all the fires in this image taken by Suomi NPP satellite's VIIRS (Visible Infrared Imaging Radiometer Suite) instrument on April 11, 2017 are controlled fires set by farmers to manage land.  Farmers in Kansas as allowed to burn grass every year to produce better grass for cattle.  The grass burning typically occurs between March and mid-April on a yearly basis.

Both obesity and being underweight are associated with an increased risk for migraine, according to a meta-analysis published in the April 12, 2017, online issue of Neurology®, the medical journal of the American Academy of Neurology. The researchers looked at all available studies on body mass index (BMI) and migraine. 

A new reconfigurable device that emits patterns of thermal infrared light in a fully controllable manner could one day make it possible to collect waste heat at infrared wavelengths and turn it into usable energy.