Brian Koberlein on Google+ on Astronomy contains a number of interesting articles on current developments in astronomy and relativity.
Added 21-Oct-2013: Brian Koberlein noted that he now has 25,000 followers in Google+.
Added 01-May-2014: Brian Koberlein now has 32.000 followers and 22 million views on Google+.
Very good article on timing CPU bound application.
I recently discovered a Linux shell script that was running slowly due to an inefficiently implemented loop. This innocent investigation ended up uncovering misleading information from time and a bad interaction between the Linux thread scheduler and its CPU power management algorithms.
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