...because I have no idea if anyone is watching this show.
http://insidetv.ew.com/2013/06/01/orphan-black-season-finale-review-tatiana-maslany-dazzles-the-clone-sisterhood-frazzles/http://www.thetvaddict.com/2013/06/01/orphan-black-redux-clones-and-siblings-and-twins-oh-my/ I knew it! Sarah and Helena were the twins. That's why Sarah could have biological children while the (other) clones were sterile.
I still believe Sarah and Helena are the Original Experiments, and that Kira has that healing factor because of all the insanity in Sarah's DNA. No wonder any offspring of either Sarah or Helena would be... superpowered, essentially.
I honestly have no clue why I love the show so much. It airs right after "Doctor Who" on BBC America, so I keep on with it just because. But it's getting so freaking awesome. I hope Season Two gets awesomer. I hope my theory about Sarah is correct.