A teacher wears a mask while speaking with her students at Berastagi village in Karo district, Indonesia's North Sumatra province, September 20, 2013. The residents of this region around Mount ... more 
A teacher wears a mask while speaking with her students at Berastagi village in Karo district, Indonesia's North Sumatra province, September 20, 2013. The residents of this region around Mount Sinabung have taken to wearing masks due to the volcanic ash in the air, as the volcano has been erupting. REUTERS/YT Haryono (INDONESIA - Tags: DISASTER ENVIRONMENT EDUCATION) less 
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Reuters | Photo By STRINGER/INDONESIA / REUTERS
Fri, Sep 20, 2013 7:38 AM EDT