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In 1907, a nurse arrives in the Belgian Congo to work for a missionary doctor but meets a grumpy animal hunter who secretly plans to search for gold in the dangerous Bakuba tribal region.

Emmy Coer, a computer genius, devises a method of communicating with the past by tapping into undying information waves. She manages to reach the world of Ada Lovelace, founder of the idea of a computer language and proponent of the possibilities of the "difference engine." Ada's ideas were stifled and unfulfilled because of the reality of life as a woman in the nineteenth century. Emmy has a plan to defeat death and the past using her own DNA as a communicative agent to the past, bringing Ada to the present. But what are the possible ramifications?

In Tibet's Changtang region, nomads harvest salt to buy barley. A clan prepares four of its men for an annual trek to Lake Tsento, where they rake salt from shoals into piles, then into bags, and onto their yaks to return, 90-days in all. After picking an auspicious day to depart, they feast, sing, tell stories, and race horses. Women are forbidden on this sacred trip. All is ritualized: Margen cooks, Pargen prepares burnt offerings and distributes meat, Zopon cares for the caravan of 160 yaks, Bopsa bends his strong back to arduous work. To each other they speak the secret language of saltmen; they pray and observe exemplary behavior. The goddess of the lake smiles upon them.