How gravity causes a perfectly spherical ball to roll down an inclined plane is part of the elementary school physics canon.

How gravity causes a perfectly spherical ball to roll down an inclined plane is part of elementary school physics canon. But the world is messier than a textbook. Scientists have sought to ...

In a press release, the ESA announced that the object — a round metal demonstration part, produced on the International Space Station, that features a variety of stubby cylindrical objects ...