NASA’s Next Mission: Mars, Titan or Comet?

You can think of NASA’s Discovery program as a sort of outer-space American Idol: every few years the agency invites scientists to propose unmanned planetary missions. The projects have to address some sort of fundamental science question, and they have to be relatively cheap to pull off — say, half a billion dollars or so

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7 killed in Puerto Rico shooting

Authorities on Sunday were investigating a shooting outside a neighborhood bar and grocery store in northern Puerto Rico, which killed seven people and wounded at least 25 others. Standing about a half mile high, it will be the world’s tallest building, with the most floors (164) and the world’s highest and fastest building

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