Juan Gilbert is developing a video game with his students at Auburn University that is designed to teach algebra through hip-hop music.

He says, "it's a national necessity - for our security and for our economy."

According to the National Science Foundation, in 1999, one-third of all people holding science and engineering doctorates in the United States were born in another country. Among PhD-holding computer scientists, half were born abroad; for engineers, more than half; and within the federal government, one-sixth.