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Visitors mourn at the Armenian Genocide Memorial in Yerevan, Armenia. David Mdzinarishvili/Reuters

The 100th anniversary of the Armenian genocide

On the 100th anniversary of the Armenian genocide, we asked scholars to reflect on the significance of Armenian insistence on remembering and Turkey’s insistence that the genocide never happened.
How do we think about something we can’t see and don’t experience in our everyday lives, but seems to be pushing our universe apart ever faster? NASA, ESA, G. Illingworth, D. Magee, and P. Oesch (University of California, Santa Cruz), R. Bouwens (Leiden University), and the HUDF09 Team

Explainer: the mysterious dark energy that speeds the universe’s rate of expansion

Einstein’s theory of gravity says dark energy must be out there, accelerating the expansion of our universe. But what is it and how can we try to figure out more about it?
Trying to stop an incinerator project in Baltimore. United Workers/Flickr

Environmental justice: big ambitions, little action

The EPA and other federal agencies have yet to address environmental justice – despite a long history of poor and minority communities suffering environmental ills disproportionately.
The Dalai Lama has been coy about his successor. Sergio Carvalho/Flickr

Could this Dalai Lama be the last?

An elaborate and lengthy selection process is in danger of being co-opted by the Chinese government.