this excellent book makes you think about that in a systematic and serious way. if you like malcolm gladwell, you'll enjoy this book. now for the last look. >> i think the united states honestly, sadly, cannot relax our entrance criteria. we're having to be very careful about who we let enter this country from these war-torn regions to ensure that terrorists are not coming here. >> that was republican presidential candidate carly fiorina, voicing an opinion many in america share, despite the fact that america was founded by those fleeing religious persecution. the first refugee legislation in this country was not passed until 1948. president truman wrote, quote, i believe that the admission of these persons will add to the strength and energy of the nation. and there is evidence to say that truman was correct. in regard it refugees and more broadly migrants. for example, according to one study of australian migrants out