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By Gary Levin, USA TODAY

Jon Stewart returned to Comedy Central's The Daily Show Tuesday after a summer-long absence.

He spent the last few months in Jordan directing Rosewater,an independently made Iranian political drama based on a true story,from his own adapted screenplay. Stewart's 12-week break was his longestyet from the show, which he joined in 1999 as a replacement for CraigKilborn.

Daily Show correspondent John Oliver filledthe anchor chair for eight weeks of original episodes, earningaccolades for his stint. The show has aired repeats since Oliver's lastepisode on Aug. 15.

Stewart no doubt will talk about his summer (he chatted via Skype with Oliver on air), and the news he's missed riffing on.

Thisweek's guests are a typically eclectic mix: Tonight's show (11 p.m.ET/PT) features Andrew Harper, head of the United Nations Refugee Agencyin Jordan; Wednesday's has Mario Livio, author of Brilliant BlundersFrom Darwin to Einstein: Colossal Mistakes by Great Scientists ThatChanged Our Understanding of Life and the Universe. And Thursday he hosts actor Michael C. Hall (Dexter).