On the first morning of the first day of their summer vacation, J.D. Kidd and his best friend resolve to have an absolutely perfect day before the summer ends.

The reclamation of aluminum-anodizing sludges produced as a result of finishing extruded architectural aluminum using etching and anodizing processes was studie

This compilation of long-inaccessible puzzles by a famous puzzle master offers challenges ranging from arithmetical and algebraical problems to those involving