When a wildfire intensely heats air close to the ground, it can rise rapidly and start to spin into a narrow vortex. As more ...

You can be cut, crushed, pulled in or struck by an object thrown by these machines. They have cutting edges, gears, chains, revolving shafts, rotating blades, levers and similar hazards. You can also ...

Rotating biological contactors are large discs on rotating shafts that are mounted in wastewater tanks, but only partly submerged. As the discs turn, the microorganisms on them repeatedly contact both ...

Specifically, the hour minute part of the shaft. Rotating lithophanes of your loved ones makes for a pretty cool project, and there isn’t a whole lot to this build to make it difficult.