This extended week in the department of Statistics at Wharton has been quite fruitful for me! Partly due to the extra four hours of work I was getting every night by remaining (almost) on French time, partly due to the warm welcome I received from the department, partly due to having to prepare this course on likelihood-free methods and rethinking about the fundamentals (the abc?!) of ABC (and partly due to resisting buying Towers of Midnight on Tuesday morning at dawn!). The feedback I got during the course, mostly from Wharton faculty, was invaluable and I also appreciated the invitation to chat with the students at the lunch student seminar about my research experience (although it must have been mostly boring for them!) It was also a wonderful opportunity to catch up with friends of more than 20 years… In short, a great “working vacation”!