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
What Do You Mean? Do You Mean?" was performed at the 2015 MTV Europe Music Awards on October 25. Moreover, the song was also included on the set list for the Purpose World Tour. What Do You Mean? "What Do You Mean?" is a song recorded by Canadian singer Justin Bieber for his fourth studio album "Purpose" (2015). The song was released on August 28, 2015, as the album's lead single by Def Jam. Written by Bieber, Jason "Poo Bear" Boyd and Mason Levy, the song was produced by MdL and co-produced by Bieber. "What Do You Mean?" is a pop and tropical house