List for time-travelling

(via) Oh, and btw, an highly important tool for 2010: a reminding list of important stuff in case of time-travelling:

Why do I blog this? It's always curious, as a thought experiment, to think about what one would put in this sort of list. Perhaps asking my students "What pieces of knowledge and artifacts would you like to bring in the past, in case you can time-travel?" would be a good brief (to start off a discussion about what would change accordingly).