Gears of War 2 will be here in a matter of weeks, and it looks like the viral marketing campaign is being kicked off — at least for folks in the media. We recently received a bulky metal cog in ...

Researchers have discovered, for the first time, “mechanical gears” in nature. Juvenile planthoppers use a set of interlocking teeth, similar to cogs, to coordinate their legs as they jump ...

The cogs, chains, and chainrings on this bike are always moving, but only one gear is ever doing the work. Seth at Berm Peak suggests that the shifting is instantaneous and seemingly perfect ...

It gives “auto mechanic” a new meaning. Engineers have devised gears and cogs that make themselves, saving the expense of machining the tiny parts that keep microscopic motors ticking over.

Background. A gear is a special type of wheel. It is a disk that has teeth, called cogs, around its edge. Most of the time the teeth of two gears interlock, making the two wheels turn together.