Outflows and Jets I: a personal take

As a session chair I have the privilege to write down a few comments on four talks that were delivered under the general title of “outflows and jets I”. This and the session that followed it, grouped work on circumstellar environments of, post-AGB stars, proto-PNe and PNe. After summarizing some of the highlights, I pose the question of which observations, if any,reveal the presence of a common envelope ejection in the past of a PN. Finally, I point out that the finding that most or all PNe have a binary origin, while solving some of our problems, might be in contrast with the number of known close main sequence binaries.