Healthy proteins coil up into precise ball-like structures that ensure they interact only with their intended targets.

FORBES: Health

So while I spent my weekends writing essays with a room full of Poindexters who preferred the thrills of multiple choice test taking to tossing around a sports ball, I maintained a healthy social life, which, to my naive mind, also meant picking up a couple of bad habits.

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Unlike in a healthy shoulder, where the humerus ends in a ball shape and fits into the shoulder blade to form a shoulder, in reverse shoulder replacement surgery the anatomy is reversed.

CNN: SHARE THIS

All of us can pack a healthy lunch for our son, or go outside and play ball with our daughter.

WHITEHOUSE: Weekly Address: Celebrating Fathers

New skipper Andrew Strauss was dismissed for a second-ball duck before Pietersen and Owais Shah (125 not out) gave England a healthy start.

BBC: Pietersen smashes England century