I said "pretend you are angry with your computer", Carsten heard correctly but I think Philip thought I said pretend you are happy with your computer. Today my HL classes worked through the Doppler exercise which would have been more of a success if a good number of students hadn't arrived with new / upgraded computers. Mac users were laughing of course, yes Philip has a Mac so he wasn't pretending.

The afternoon session was even worse as the internet connection decided to throw a wobbly randomly spraying out false IP addresses to all my students. After a start like that it can only get better. Shows how important good infrastructure is.