Natural rubber at least showed promise as rubber sources, include the rubber fig ("Ficus elastica"), Panama rubber tree ("Castilla elastica"), various spurges ("Euphorbia" spp.), lettuce ("Lactuca" species), the related "Scorzonera tau-saghyz", various "Taraxacum" species, including common dandelion ("Taraxacum officinale") and Russian dandelion ("Taraxacum kok-saghyz"), and perhaps most importantly for its hypoallergenic properties, guayule ("Parthenium argentatum"). The term gum rubber is sometimes applied to the tree-obtained version of natural rubber in order to distinguish it from the synthetic version. The first use of rubber was by the indigenous cultures of Mesoamerica. The earliest archeological evidence of the use of natural latex from the
Spread the Word to End the Word "retards" by White House chief of staff Rahm Emanuel to describe liberal groups planning attack ads on Democrats was reported in the Wall Street Journal. This led to Emanuel's apologizing to Tim Shriver, chief executive of the Special Olympics. A meeting was held with Emanuel, who was asked to visit www.r-word.org, and he promised to take the R-word pledge. Spread the Word to End the Word Spread the Word to End the Word is a United States national campaign to encourage people to pledge to stop using the word "retard". End the "R" word advocates believe the use of the