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The ecliptic hits the horizon at a shallow angle on early spring mornings, which keeps Mercury buried in the glow of morning twilight at northerly latitudes.
Matt Daniel's WeatherGlobe
U.S. snow and ice in 2013 compared to 2012
Blogus scientificus by Alex Reshanov
Humans aren't top predators, says new report
Earth Trekker by Deanna Conners
Early warning system for abrupt climate impacts