a network of interlocking quartz grains of incredible strength. the interlocking crystalline structure of quartzite makes it a hard, tough, durable rock. it is so tough that it breaks through the quartz grains rather than breaking along the boundaries between them. this is a characteristic that separates...
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competitive on the playing field you need peak performance from your entire body – and your eyes are no exception. sports vision is "fullscope," and primary eye care can help you optimize these three key visual skills: contrast sensitivity lets you see fine details from a distance – like the subtle contours of...