"Look at this!" my husband, Jim, said, as he handed me the American Airlines magazine on our flight to Kauai, Hawaii, on March 6. An entire page revealed the beauty of Kauai's Glass Beach. "Oh my gosh ...

While the most common image of beaches includes white sand and palm trees, beaches come in a rainbow of colors, from (almost) pure white to midnight black. That's because sand itself is the product of ...