This article is from the Scouting FAQ, by Bill Nelson email@example.com, Soaring Golden Eagle firstname.lastname@example.org and Alan Houser email@example.com with numerous contributions by others.
In his book, "Scouting for Boys," Sir Robert Baden-Powell, Scouting's
Founder, recommends the use of Esperanto as a "secret language" among
Scouts. The first steps to create the Skolta Esperanto-Ligo (Scout
Esperanto League) took place in 1918, after the appearance of Alexander
William Thompson's booklet proposing such an organization. Since then,
SEL has held its own international camp-outs, and participated in World
Scout Jamborees. For the World Jamboree in August in the Netherlands, an
international group of SEL activists is organizing an activity in which
participants will learn the basics of Esperanto using a space-age
learning tool, "Esperanto-Elektro."