STAR TREK is seen in more than 100 countries and has been translated into dozens of languages. Every month, a classic STAR TREK or STAR TREK: THE NEXT GENERATION novel is published by Pocket Books. More than 63 million STAR TREK books are in print and have been translated into more than 15 languages including Chinese, Norwegian, Hungarian, and Hebrew. "Trekkies," now called "Trekkers," are the only fans listed by name in the Oxford English Dictionary. STAR TREK conventions are held every weekend of every year in at least four different U.S. cities, annually attracting more than 300,000 U.S. fans and an estimated one million fans worldwide. The first U.S. Space Shuttle, the "Enterprise," was given its name after NASA received 400,000 requests from STAR TREK fans. A 1993 study from Purdue University found that children learn more about science from STAR TREK than from any other source.