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

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 ...

Two cylindrical objects were being examined at the scene of a security alert close to a day care centre in Co Down. A key road through Dromore was closed in both directions as a cordon was put in ...