Questions About Physicist Cosmologist

so i just heard a radiolab interview with brian greene. can someone please clarify his conclusions on the infinite possibilities of an infinite universe???

okay, so i just got done listening to a [radiolab interview with physicist/ cosmologist, brian greene.] (http://www.radiolab.org/blogs/radiolab-blog/2008/aug/12/the-multi-universes/) if i understood him correctly, he fully believes that there are multiple "copies" of the planet earth existing in o…
http://www.reddit.com/r/askscience/comments/10167b/so_i_just_heard_a_radiolab_interview_with_brian/

ELI5: What does the universe exist inside of? Any theoretical physicists or cosmologists or just super educated genius scientist's out there? Please help me understand this. Been a lifelong question. Better explanation below.

What is beyond the universe? It seems to me, that, from a living beings point of view anyway, that everything we can observe exists within a larger system of something else. Very crude example below: electrons in atoms atoms in molecules molecules in proteins proteins in cells cells in organs…
http://www.reddit.com/r/explainlikeimfive/comments/1txu1o/eli5_what_does_the_universe_exist_inside_of_any/

Question about dark matter, dark energy and unseen dimensions for reddit physicists and cosmologists

Background: Roughly 5% of our universe is directly observable, another 23% is made of dark matter and a whopping 72% is composed of dark energy (percentages are approximate). We can indirectly measure the effects of dark matter - the gravity it exerts bends light and we measure the resulting dist…
http://www.reddit.com/r/askscience/comments/bsmv6/question_about_dark_matter_dark_energy_and_unseen/