Morning Movers: Roper Industries, Natural Gas, Corn

July 30 (Bloomberg) -- Bloomberg's Tom Keene, Scarlet Fu and Mike McKee highlight the news you need to follow for today's trading. They speak on Bloomberg Television's "Bloomberg Surveillance."
Mila Kunis Helps Miner Become Top Emerald Producer
25:10 - Gemfields CEO Ian Harebottle discusses the gemstone business with Bloomberg's Pimm Fox on "Taking Stock." (Source: Bloomberg)
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