![](http://static.ddmcdn.com/gif/blogs/dnews-files-2013-09-diatom-alien-200x200-130920.jpg)
The alien diatoms are back! This time they're infesting our
stratosphere, messing with our high-altitude balloons... possibly.
![](http://static.ddmcdn.com/gif/recipes/curiosity-methane-200-130919.jpg)
NASA's Mars rover Curiosity has scoured the red planet's
atmosphere for methane -- possible evidence for microbial life -- but
has found none.
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