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Airplane contrails and their effect on temperatures

Contrails from airplanes impact temperatures at Earth's surface. But do they raise or lower them?

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What would happen if Greece exited the eurozone?

Rumors are rife of a Greek exit from the eurozone. While no country has yet dropped the common currency, there are some indications of what will transpire if Greece does.
Spelling bee: Intensity makes it the experience of a lifetime (+quiz)
In heartland of legal marijuana movement, doubts linger, poll suggests
Decoder Wire: What do women voters want? In a word: jobs.
Somalia famine has ended, but many still hungry

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Mae Azango has gone undercover to report on female circumcision, a rite of the Sande society in Liberia that is performed on young girls.

Mae Azango exposed a secret ritual in Liberia, putting her life in danger

When journalist Mae Azango wrote about a secret women's circumcision ritual in Liberia, she received death threats.