If any other sci-fi subject can rival alien visitors in the popular imagination, it's time travel. As with the prior program, a familiar trope is here fragmented into new and illuminating facets. Travelers from the future search air quality disasters of the past for insight into their own time or become fascinated by the minutia of contemporary life. Scientists probe soil and water to reconstruct and simulate cities long-since swept away. Familial memory intertwines with history. And market speculators hope to sleep, in cryogenic stasis, until ill-considered investments deliver dividends in some distant future.
