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I was lucky to live , while others died or were maimed . Only recently , however , have researchers like Muller demonstrated that some arterial plaques are stable and unlikely to rupture , while others , named " vulnerable plaque " by Muller , are unstable and trigger 80 percent of heart attacks . For example , think of mushrooms that grow in the wild : some are safe to eat , while others are poisonous . They noted that for some actions the issue of reversibility did not arise , while other actions were automatically terminated or withdrawn upon full settlement of overdue obligations to the Fund . About one million are thought to be persons on long-term temporary visas such as foreign students , guest workers , and other exchange visitors , and the rest are legal permanent residents ( also called green card holders ) .2 Some of those with green cards are eligible for citizenship but have chosen not to naturalize , while others are not yet eligible for naturalization because they have not lived in the country long enough .