To those who say the challenge is not politically viable: I suggest they go before the American people and try to defend the status quo. (dotearth.blogs.nytimes.com)
When it comes to keeping pets indoors, there are quite a few benefits, that being said, there are also some problems or better said challenges. (smart-mass.org)
Mr. Walsh said the challenge for Aurora is to commercialize its scientific advance. (green.blogs.nytimes.com)