He writes: Just being able to see an eye chart isn't the whole equation. You have to strengthen the muscles inside and out of your eye. The letter ball, shown in the video above is an awesome way ...

Mesmerising video shows skydivers playing 'hand tennis' 13,000 ft above the earth Pair play catch while hurtling towards the earth at more than 120 mph They use a specially weighted ball so it ...

Imagine having a virtual "tennis coach" that knows exactly where your racquet hits the ball. It counts forehands and backhands, serves and smashes. And when play is finished, the coach compares ...