The actor who came to fame (and won an Emmy) on the 1970s TV series "Marcus Welby, M.D.," James Brolin, has appeared in scores of films and TV shows since, and is currently the narrator of the new Netflix sci-fi series, "Sweet Tooth." Correspondent Tracy Smith talks with Brolin, now 81, about his continued love of work, and about his 23-year marriage to singer Barbra Streisand.

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