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Those of us boomers who are wistfully pushing 50 (and those who’ve pushed past it) can at least feel cool that we’re in hip company: The chicken-leg-in-a-circle Peace Sign turns 50 this year too. As part of the celebration, National Geographic has brought out a groovy little photo book called Peace: The Biography of a Symbol.

As noted in a Time magazine piece and other advance press, this book insightfully traces the origins of this humble logo design by British textile designer Gerald Holtom through its modern prevalence throughout the peace-loving world. Compiled by photographer-writer Ken Kolsbun and author Michael S. Sweeney, the book also does much more — it serves as a clear, fact-laden, mostly non-dogmatic history lesson on the entire Peace Movement.