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The president reacts to the news of the shooting in Charleston, South Carolina. Jonathan Ernst/Reuters

Obama and the N-word

What does it mean for any president, much less a black one, to use such a word?
People in Columbia, SC speak out. Perry B McLeod

Is the Confederate flag unconstitutional?

Does the Confederate flag tell African American citizens that they are inferior? And if so, does that violate the equal protection clause of the Fourteenth Amendment?
The Export-Import Bank provides financing and other services to help foreign companies buy US products like Boeing’s 787 Dreamliner. Boeing 787 via www.shutterstock.com

Why Congress should keep the imperiled Export-Import Bank

The more than 80-year-old credit agency is set to expire at the end of the month if Congress does not act to keep the profitable bank alive.
Packing heat: concentrating sunlight into a reactor to split H2O and CO2 – a step toward making liquid fuels. Courtesy of Professor David Hahn, University of Florida

Solar fuels: how planes and cars could be powered by the sun

Rooftop solar power is exploding in the US but some scientists are pursuing a radically different route in renewable energy: storing solar energy as a liquid fuel.