How laser printers work. The paper is given one charge and a drum of toner (which is basically colored plastic) is selectively given the opposite charge. When the toner touches the paper (sometimes through intermediate transfer drums), toner clings to the paper; it's then pressed onto the paper with a hot roller.
A good piece on how to deal with high winds when you've got a tower crane on your jobsite. "Since some tower cranes can be disassembled in just a few days it is possible to have the cranes dismounted and out of harm’s way in time [before the storm hits]. Of course, it’s expensive to disassemble a crane like this and then put it back up, especially in the event that a storm changes path and doesn’t hit the construction site at all, but it’s likely less expensive than dealing with an uncontrolled tower collapse."
The European X-ray free electron laser produced its first scientific paper, on the 3D structures of protein microcrystals. EuXFEL will be the largest X-ray laser until it's surpassed by a new equipment being built by SLAC.