CNN's Lou Dobbs reports on the effect of immigration on science salaries, and Andre at Biocurious wonders if he's not correct in his thinking. "[Companies] keep wages low by exploiting visa rules, and bringing cheap foreign workers into this country," Dobbs says. The number of foreign postdocs increased by 52 percent since 1996, while the number of postdocs who are US citizens or permanent residents has only grown by 9 percent.