"A Colombian mathematician assembled these eighty brainteasers, forming a stimulating collection of word problems, puzzles involving chess pieces, sudoku-style
A Colombian mathematician and professor assembled these 80 brainteasers while living in Bogotá, forming a stimulating collection of word problems, puzzles invo
A firsthand account of Colombia's turmoil by a journalist who was held captive by rebel guerrillasIndependent journalist Garry Leech has spent the last eight ye