| http://www.w3.org/ns/prov#value | - They rely on gravity, or other forces, to move fluids or particles.Varanasi's team decided to use external fields, such as magnetic fields, to make surfaces active, exerting precise control over the behavior of particles or droplets moving over them.The system makes use of a microtextured surface, with bumps or ridges just a few micrometers across, that is then impregnated with a fluid that can
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