Today's 14% jump caps a five-day 60% advance in Zion Oil & Gas (ZN) on no apparent news, but this isn't the first time ZN shares have seen such wild swings. Evan Buck urges extreme caution in the company that's "definitely not a kosher investment," highlighting Delek US Holdings (DK) and Noble Energy (NBL) as far wiser plays on Israel's natural gas finds.
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