54:59duration 54 minutes 59 seconds
ECS-40: 2018-01-24 15:10
ECS-40 Lecture 2018-01-24 at 15:10
55:00duration 55 minutes 0 seconds
ECS-40: 2018-01-22 15:10
ECS-40 Lecture 2018-01-22 at 15:10