Rabbi Jeffrey Saks discusses "The Rarest Blue: The Remarkable Story of an Ancient Color Lost to History and Rediscovered", Baruch Sterman's book about the revival of tekhelet - Biblical blue (visit www.TheRarestBlue.com and www.tekhelet.com). The book is a riveting adventure tale, in which halakhah (Jewish law) and its interface with nearly every field of human science, wisdom and endeavor, serves as the main "hero" covering 1,300 years of Jewish history.