EdPuzzle is a free tool that allows you to embed questions, comments, and voice-overs into videos. It is an excellent accompaniment to any online lesson because it turns the naturally passive nature of watching a video into an interactive experience that requires learners to focus and think as they watch. Teachers can search from a massive library of already created EdPuzzles to adapt, or they can create their own with any video either online or uploaded. It is especially recommended as an interactive addition to screencast lessons. Live data is provided to show where each student is during a video (synchronous remote instruction, anyone?) and how many times a student needed to watch a segment to answer a question. It also integrates with Google Classroom.