The "perambulator", or "pram" to the Brits, was invented in 1733 by William Kent for the Duke of Devonshire's children. What is it?

What do you call a pellet of frozen precipitation? A pen with some 1,400 diamonds showing a mountain range was made in 2006 for which company's 100th anniversary? A pentad is a group of how many? A pentadecagon is a polygon with how many sides? What word names a perceived snub or act of contempt? What is a perfect game score in ten-pin bowling? A printer's "perfect" one of these contains 516 sheets instead of 500. What? What is an unintended period of silence during a radio broadcast called?