This challenging puzzle book focuses on the inventions and ideas of the twentieth century's most revolutionary inventor, Nikola Tesla. Solve cryptograms and anagrams of Tesla's writing to learn how the genius thought about technology and how he imagined the future. Also includes crossword and word search puzzles, plus challenges involving Tesla's historical rival, Thomas Edison. An answer key in the back of the book is great to refer to if you need help solving some of science's mysteries. Spiral bound; 192 pages. 7 1/4"L x 9"H.