Almost without exception, everytime I tried to use a bit of technology last week it went wrong.

S1 Science revsion using Web sites - links disappeared or wouldn't work for one class, internet connection died for the other class

S5 Physics using flexi cam to show how to connect circuit - camera died, wanted the software to be reinstalled (which I can't do as I'm not a system administrator - waited 2 days)

Only success - S6 Physics using (freshly re-installed) flexi cam to show electrical filed patterns.

S4 off on study leave next week - 6 fewer possibilities for disaster to strike.