As you enjoy your burrito from the new Chipotle that opened up in Kendall this June, you may wonder what else has changed on campus over the summer. Here’s a summary of some of the topics The Tech has covered to get you up to speed.

With most new markets comes competition, as is the case with online education. Today, there are four major platforms that produce content specifically for online instruction: Coursera, Udacity, and edX, which provide university-level content, and Khan Academy, which largely targets K-12 education. While they all offer content designed specifically for web-based instruction, they differ slightly in missions, delivery, and focus.

There are many ways to measure the traction of a social media platform: time spent, page views or unique users. But it might be useful to add one more metric: if the leader of the free world stops by to answer questions from your users, you’re probably doing OK.