Science Friday: Shoe-string Theory – Science shows why shoelaces come untied | Device pulls water from dry air, powered only by the sun

Date:  April 12, 2017

Source:University of California – Berkeley

Summary: A new study shows why your shoelaces may keep coming untied. A better understanding of knot mechanics is needed for sharper insight into how knotted structures fail under a variety of forces.


Device pulls water from dry air, powered only by the sun

Metal-organic framework sucks up water from air with humidity as low as 20 percent

April 13, 2017
University of California – Berkeley
While it’s easy to condense water from humid air, machines that harvest water from drier air require energy. Researchers have created the first water harvester that uses only ambient sunlight. The key component is an extremely porous material called a metal-organic framework that absorbs 20 percent of its weight in water from low-humidity air. Sunlight heats the MOF, releasing the water vapor, which condenses to produce liters of water per day.