...because they made the same peak traffic on SuperLectures as ICASSP and Barcamp conference attendees - see the analytics graph.
Over 400 students of bachelor ISS (signals and systems) course visited 13 lecture recordings over 1200 times in (and only in) one day (really intensive study :).
To compare, the ICASSP conference had over 2000 attendees and Barcamp had over 300 attendees.
Good work guys.