Sanding (dance) the box of rosin before matches to improve his grip. Sims' popularity as a tap dancer and career at the Apollo certainly made him one of the most if not the most influential sand-dancer of all time. Sand dancing was also used by the popular comedic vaudeville trio, Wilson, Keppel and Betty. They spread sand over the stage in one of their most well-known numbers, "Sand Dance". In their performance, there was no allusion to African American heritage; rather to the sandy environs of Egypt, a clear inspiration for their number. In spite of this deviation from the African American
20th century were developed in the 20th century. In the first part of the 20th century, measure theory, functional analysis, and topology were established, and significant developments were made in fields such as abstract algebra and probability. The development of set theory and formal logic led to Gödel's incompleteness theorems. Later in the 20th century, the development of computers led to the establishment of a theory of computation. Other computationally-intense results include the study of fractals and a proof of the four color theorem in 1976. One of the prominent traits of the 20th century was the dramatic growth of technology. Organized