TheattempttosendandlandastronautsonMarsrisksbillionsofdollarsandthelivesofthosebraveenoughtoattemptit.Isthepossiblebenefitreallyworththerisk?Andisitreallyachievable? 　　GuidingusthroughthisethicalandscientificminefieldisDrKevinFong.Kevin'sdiversebackgroundinastrophysics,aeronauticsandmedicinemakeshimuniquelyplacedtounders...