Most recent episode (ep. 16, "RAM") was fantastic, and a brilliant example of how to effectively use flashback for an entire episode. This show never fails to surprise, right from the opening credits, LOL.
Finally, we got to see the origin of the laptop, with some familiar faces...and how they all tie-in together into the present. Number of the week was none other than Joseph Mazzello, who was Tim in Jurassic Park.
Root seems to be gathering her own army of hackers to protect the machine (Casey this episode, plus another one shown in a previous episode)