Stay, Nebraska Begs Brightest, We'll Pay You
Nebraska is on all-out quest for smart people, hoping to reverse talent drain that helped produce state unemployment rate of 1.6 percent, lowest of any state; Gov Ben Nelson is pushing bill that would pay up to half of undergraduate or graduate school costs for smart students who agree to stay on after college and work for three years in state; Nebraska businesses are offering job applicants wages and benefits too good to turn down; Nebraska's desperate search for highly skilled workers is reflection of revved-up national economy squeezing region that for years has watched many of its youngest, best and brightest go elsewhere; photos (L)