The School of Greatness

I really enjoyed a particular podcast the one with Shawn Johnson on it and I went to look for it on here and I don't see it any place to be found? Do you delete podcasts off of here if they get really old. I'm just really happy that I still have it saved on my iphone and ipod so that hopefully I can put it back in my itunes library. I had to switch computers and lost all of the podcasts that I don't have on my iphone of ipod. If this is something that can be fixed that would be great.