Jun 06

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For those Earthlings lucky enough to be under cloudless skies during Tuesday's Venus transit, it took the form of a pea-sized dot gliding across the Sun's northern hemisphere. For more perspective, NASA has collected a stunning sampling of images both…

Dr. Laura Stachel and her husband founded We Care Solar to help bring light to the estimated 300,000 hospitals and clinics in the developing world that don't have reliable sources of electricity. Our slideshow highlights Stachel's work toward equipping remote…

Since undertaking market reforms in late 1970s, China has enjoyed an economic boom -- but the economic progress has also produced serious environmental damage and pollution problems. Margaret Warner reports on China's environmental woes and their impact on the run-up…

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