A multitude of devices, vehicles, tools and equipment possess rotating elements such as motors, gears and teethed targets. In many instances, the rotational speed of these elements needs to be ...

What can spin 100,000 times in a minute and generate forces over 30,000 times the force of gravity? Surprise! It’s a toy that’s thousands of years old, called a whirligig or buzz toy. Here’s how it ...

Though we sum up a day as 24 hours and a year as 365 days, Earth's rotational and orbital speeds aren't exactly consistent. Instead, both fluctuate, swayed by atmospheric drag, tidal forces, changes ...

Earth’s rotational speed is changing, and we’re more than partly responsible. A gigantic dam, our extraction of groundwater, melting ice sheets and rising sea levels are among the human-linked factors ...

The Earth is predicted to increase its rotation speed in July and August, once again bucking the trend of a slower rotation over time. Though there are clear reasons for the increased rotational speed ...