What basic material is used to make casts for broken bones and sculptures?

In the 1990 U.S. census, which color was also the fifth most common last name? Which 1995 film inspired a TV series starring Annie Potts as an inner-city schoolteacher? Based on the calculations of French mathematician Urbain Le Verrier, Johann Galle discovered which planet in 1846? Based on Xavier Roberts's soft sculptures, which dolls were a hugely popular item for "adoption" in 1983? Military basic training is also known by what nickname? What roofed shelter for a car, basically a garage without side walls, is associated with 1950s architecture? Which guitar effect, controlled with the player's foot and named for the sound it makes, was invented by accident by an… Basketball history changed on October 30, 1954, with the introduction of which device in NBA games?