In October I published an essay on Article-Level Metrics (ALM) in PLOS Biology (Fenner, 2013). The essay is a good introduction into Article-Level Metrics, and I am proud that it is part of the Tenth Anniversary PLOS Biology Collection. Like all PLOS content, the article was published with a Creative Commons attribution license, allowing me to republish the article on this blog. I have now done so and the article is available here.