1.   A nuclear-powered ion drive could sent a craft to Pluto in half the time as existing rockets, Weiler said.

2.   Many have entered the United States illegally to make whatever money they can to send back home to their desperately poor families.

3.   Poor children go to public schools, while middle-class families do everything they can to send their kids to private schools.

4.   Such a move could sent the oil price tumbling, analysts warn.