Ballroom dancers tend to roll and pivot on the edges of their feet, using a series of muscles and tendons to achieve a balance and dexterity honed with years of practice.

CNN: Boston bombings destroy dancer's foot, but not her spirit

The square pieces on the worn-out board have lost their edges to age and usage.

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By focusing on the edges separating dark from light areas, the researchers classified their dozen cities into three types.

ECONOMIST: Urban geography

Today conditions in Roma settlements on the edges of town and villages rival Africa or India for their deprivation.

ECONOMIST: Europe's Roma

Pebble feels very comfortable when fastened on the wrist -- it's relatively lightweight, and the smooth edges maintain their distance from sensitive skin.

ENGADGET: Pebble smartwatch review Mobile

Use constraints to lay out the subviews within the scroll view, being sure that the constraints tie to all four edges of the scroll view and do not rely on the scroll view to get their size.

ENGADGET: Apple seeds iOS 6 beta 4 to developers: here's the changelog