Since 1916, people wanting to learn English as a second language have flocked to the big brick building at 13th and Welton downtown. Emily Griffith's philosophy of welcoming "all who wish to learn" lives on in more than 350 vocational and technical courses, including a dozen different English classes. How popular is this adult education arm of Denver Public Schools? Last year training was provided for more than 14,500 students from 128 countries, ranging in age from 17 to 87. And while a smile can say a lot, a well-articulated "thank you" also speaks volumes.