Eric Pennucci of Horizon Air Services, a Boston trucking firm, does not like the idea of 18-year-olds behind the wheel of tractor-trailers. Chris Arnold/NPR hide caption

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Greeks stand outside of a local school in Athens that served as a voting station. Chris Arnold/NPR hide caption

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Pensioners holding their queue numbers try to enter a bank in Athens. The government ordered about 1,000 bank branches around the country to reopen Wednesday to help desperate pensioners without ATM cards cash up to $134 from their retirement checks. Daniel Ochoa de Olza/AP hide caption

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Pump jacks and wells work in an oil field on the Monterey Shale formation in California. Economist Michael Porter says that hydraulic fracturing, or fracking, is a "game changer" for the U.S. economy. David McNew/Getty Images hide caption

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Oil pump jacks in Williston, N.D., in December. Oil prices have been on the rise, but some analysts say the global economic slowdown, fracking and the rise of alternative energy will mean less demand and lower prices. Eric Gay/AP hide caption

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As the Nasdaq closes above the record set 15 years ago, stock analysts are debating whether the market is approaching another bubble. Bryan Thomas/Getty Images hide caption

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Labor Secretary Thomas Perez says proposed rules for financial advisers are meant to protect consumers. Nick Ut/AP hide caption

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