A whopping $66 billion deal in the agribusiness space just won the approval of antitrust regulators in Washington, D.C. That clears the way for German behemoth Bayer to acquire St. Louis-based Monsanto. Monsanto has for years ridden the success of the herbicide Roundup and seeds that are tolerant of the chemical. But now Monsanto— and Bayer — are betting on a next-generation product.

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