Phys.Org (March 28) -- Precise control of an individual particle or molecule is a difficult task. Controlling multiple particles simultaneously is an even more challenging endeavor. Researchers at the University of Illinois have developed a new method that relies on fluid flow to manipulate and assemble multiple particles. This new technique can trap a range of submicron- to micron-sized particles, including single DNA molecules, vesicles, drops or cells. Also: WAND-TV (Decatur, IL, March 28), ScienceBlog (March 28), Science 360 (NSF, March 30).