The following advertisements (adapted from "Caveat Emptor" by Robert Leighton, Games, January 1988, p. 38) show some vastly overpriced items. Read between the lines and identify the item each ad is describing.

a. Miniature, sparkling white crystals harvested in exotic Hawaii make perfect specimens for studying the wonders of science! Each educationally decorated packet contains hundreds of refined crystals. Completely safe and nontoxic.

b. It's like having U.S. history in your pocket! Miniature portraits of America's best-loved presidents, Washington sites, and more. Richly detailed copper and silver engraving. Set of four, just \(\mathbf{\$ 4 . 5 0}\).

c. Today multimillion-dollar computers need special programs to generate random numbers. But this GEOMETRICALLY DESIGNED device ingeniously bypasses computer technology to provide random numbers quickly and easily! Exciting? You bet! Batteries not required. Only \(\mathbf{\$ 4 . 0 0}\).

d. They said we couldn't do it, but we are! For a limited time, our LEADING HOLLYWOOD PROP HOUSE is dividing up and selling—yes, SELLING—parcels of this famous movie setting. You've seen it featured in Lawrence of Arabia, Beach Blanket Bingo, and Ishtar! Our warehouse must be cleared! Own a vial of movie history—a great conversation piece! Only \$4.50.

e. At your command water—or any liquid—flows upward! Could you be tampering with the secrets of the Earth? Your friends will be amazed! Just \(\mathbf{\$ 3 1 . 9 9}\).