[Cranktown City] uses a number of custom-built linear rails used as gantries for various tools in the shop. The first is on a plasma cutter, which is precise but difficult to set up or repair. Another ...

Icicles naturally develop a characteristic rippled surface — a washboard pattern with ribs that repeat every centimetre or so along the icicle’s length. Menno Demmenie at the University of Amsterdam ...