| CNN.com delivers up-to-the-minute news and information on the latest top stories, weather, entertainment, politics and more. | Mars rover | | If the Curiosity rover had been sent to Mars in ancient times, it might have found itself sinking in a stream. |
| Mona Lisa | | Leonardo da Vinci painted an earlier version of his famed masterpiece the Mona Lisa, claims a private Swiss art foundation dedicated solely to the alternate painting, which it unveiled Thursday. |
| NFL refs | | The real referees were greeted with a standing ovation Thursday night as they returned to the field after a new contract was announced less than a day earlier. |
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