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Turtle graphics is a popular way for introducing programming to kids. It was
-part of the original Logo programming language developed by Wally Feurzig and
-Seymour Papert in 1966.
+part of the original Logo programming language developed by Wally Feurzeig,
+Seymour Papert and Cynthia Solomon in 1967.
Imagine a robotic turtle starting at (0, 0) in the x-y plane. After an ``import turtle``, give it the
command ``turtle.forward(15)``, and it moves (on-screen!) 15 pixels in the