http://cosmiclog.msnbc.msn.com/archive/2009/08/06/2021783.aspx Scientists are improving their technique for bending DNA into origami shapes. The latest twist uses custom-made chemicals to turn bunches of molecules into smoothly curving circlets and gears - a trick that eventually could set the stage for practical nanomachines. DNA origami is a technique for folding the double helixes into progr…