About "Os" i was thinking that this episode, judging from some promo pics with the pictures of the machine and spoilers (olivia will probably find out that peter kills the shapeshifters), maybe goes ahead with what we've seen in "reciprocity". But, if it's true, there could be another possible connection. I refer to the peter's joke during a scene in "reciprocity" where he says to Olivia, before the tests, that he might be able to use his new-found super-powers to make the machine levitate. And in "Os" we'll see floating people because of the osmium, an element that has ties with iridium.

Any thoughts?