Melbourne, Australia–Last year, Rio Tinto made an astounding discovery at its Argyle mine in Western Australia and never said a word about it. The diamond mining company unearthed a 9.17-carat piece of rough that yielded a stone Rio Tinto Diamonds’ Patrick Coppens describes as “impossibly rare”–a 2.83-carat fancy deep grayish blue violet diamond that it

A couple of years ago, I was with my friend Adam Cohn when he made this simple yet important declaration — “San Francisco should always have a subway under construction.” My first reaction was to think of every possible objection to the concept — too expensive, too disruptive, too controversial, too many difficulties siting subway stations and determining alignments.

A couple of years ago, I was with my friend Adam Cohn when he made this simple yet important declaration — “San Francisco should always have a subway under construction.” My first reaction was to think of every possible objection to the concept — too expensive, too disruptive, too controversial, too many difficulties siting subway stations and determining alignments.