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 the....You Mean I Can't Sing?! a trio of experimental albums, "Brer Soul", "Ain't Supposed to Die a Natural Death" and "As Serious as a Heart-Attack", which were considered to be spoken word at the time, due to their use of sprechgesang. Modern critics have since dubbed these albums as precursors to hip hop music. Van Peebles wanted to record an album that showed that he could perform in a more traditional form, as opposed to the style he had used on his previous albums, titling it "What the...You Mean I Can't Sing?!" because of this. "What the...You Mean I Can't Sing?!" places more emphasis on