It was unbelievable that I could stay at home and did not have to travel to Mittweida (with a train drivers strike coming up). I could stay in the intimacy of my study and lecture from there. This has advantages, but also disadvantages.
I did learn a few things from this experience:
BTW In the lecture I went into future opportunities for the E-book like interactive books. But I forgot the way back opportunity of 3D printing of an E-book!