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 in ichnology excavation of fossil footprints in history. In the Lee Stokes reported unusual footprints he interpreted as the first known pterosaur tracks. This attribution would be controversial much of the rest of the century but has since been vindicated. The dinosaur footprints of Dinosaur Ridge in Colorado were also discovered and studied in the 20th century. The advent of the dinosaur renaissance and the publication by R. McNeil Alexander of a formula which could reconstruct their running speed based on data from fossil trackways brought renewed interest and prestige to ichnology during the late 20th century. This led to several symposia