I just learnt that my children tested positive for Covid-19 this afternoon. Even if I am fully vaccinated I do not think it's a good idea to go to the lab with you tomorrow. Thomas who could have helped you to do the lab had his second dose of Moderna today and we are afraid he will be indisposed tomorrow. I therefore think it is best to postpone the lab. I am not able to finish other teaching on such short notice (I have to finish other teaching material for tomorrow) so I will therefore cancel the teaching tomorrow. I'll get back either with zoom teaching or in room 414 on Wednesday.