Regularities in Human Actions A Review of Bursts: The Hidden Pattern behind Everything We Do by Albert-László Barabási (Dutton, 2010). This is a joint review by two authors. Its first part was written by An ZENG who is a PhD student at Beijing Normal University and a researcher in network science. The second part was written by Bertrand ROEHNER who is a physics professor at the University of Paris and a visiting scholar in the Department of Systems Science of Beijing Normal University. Written from two different perspectives, the two reviews should complement one another.