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- Better chow yields more milk: A more nutritious form of corn for dairy cows boosts farm profits, teen investigator finds
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- Building with moon rocks: Working on the moon with lunar soil and grit could prove easier, more efficient and less costly than using earthly materials
Taking Sudoku Seriously: The Math Behind the World's Most Popular Pencil Puzzle
Web edition: April 20, 2012
Print edition: May 5, 2012; Vol.181 #9 (p. 34)
A look at the popular puzzles reveals the fundamental mathematical concepts at play.
Oxford Univ., 2011, 226 p., $21.95
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