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After seven years of marriage, Alan and Celia discover that wedded bliss isn't always blissful. Clashing politics, Alan's new job and a wild local lad create tension. Caroline gets emotionally embroiled at work. Alan's brother visits. See what else unfolds in season four of "Last Tango in Hailfax."

Journey to three of the most exotic, mysterious and remote islands on the planet: Madagascar, Borneo and Hawaii. Isolated from the rest of the world, they harbor remarkable wildlife and pioneering human communities found nowhere else on Earth.

"Nova" explores new discoveries and how we have come this far on Wednesdays at 8 p.m. on Arizona PBS.