My childhood was a world where ordinary people became heroes not though desire for fame or fortune but through force of circumstance and an unwillingness to turn away from what they knew was right. It was not a world filled with rock stars and football players, but rather, a world filled with earnest young men (and sometimes women) who became scientists, adventurers and leaders against common foes. The "Tripod Series" was typical of such a world, beginning with The White Mountains and though two other books (a fourth, which I never read, was added some 20 years later) - think of it as an earlier Ender's Game authored by an earlier and less self-important generation. The author, Samuel Youd, who wrote under the alias John Christopher, has died. He will never know how important his work was to me, but I will.