This microscopic 3-D pattern was "painted" using a laser beam

Scientists at the Vienna University of Technology have developed a brand new method for positioning molecules in space with micrometer precision. They call it "3D-photografting," and it uses laser beams to place microscopic chemical structures in the nooks and crannies of a macromolecular meshwork known as hydrogel. »8/29/12 4:30pm8/29/12 4:30pm