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
The Big Word Project web applications. The students wanted to create a mass collaboration project where a global movement could be made by combining a small effort from thousands of people and research what words mean to different people. The project made use of a viral marketing campaign and relied on other people, primarily bloggers, spreading the word throughout the internet. The project has been featured in newspapers and magazines in Northern Ireland and beyond. Once a word is purchased, that word is then 'redefined' on The Big Word Project, no longer having a traditional meaning but linking to a URL of the owners’