This article is from the FAQ, by with numerous contributions by others.
Most of the successful petitions are documented by evidence such as
a letter from an interested U.S. Government agency, evidence showing
that the alien's work is funded by the U.S. Government and/or letters
from distinguished scientists/ professors in the field
attesting to the importance of the research. Cases involving defense
related research or energy related research have the greatest success.
 
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