I tried Googling around for anyone having a similar problem with iBooks or app downloading, but I didn't find close enough of a match… This is probably more of an iBooks or app store type problem than anything about this specific book. Here's what's happening: I tried downloading Life on Earth with iBooks 2 on my iPad 2 the other day when it first launched -- it continually won't go through with the download though, saying "Unable to Download 'E.O. Wilson's Life on Earth' Retry or download later from the store." and I can select either Later or Retry. Whichever option I choose, I'm still stuck with that message and it won't download. I've tried downloading the book on my Mac and it will download just fine, but when I transfer it to my iPad, the book icon will show with an almost-completed download progress bar on it, even though the file downloaded completely on my Mac, and has appeared to transfer all the way from my Mac to my iPad. So with this look of not being completely downloaded, I'm still unable to open the book. I can download a sample of this book just fine. I've downloaded a sample of another textbook and that works just fine. I've tried downloading this Life on Earth book with as much as about 2.3gb free space available on my iPad. My iPad has also been turned off and restarted a few times over the past couple of days. Any help is appreciated. I'm presently without any other ideas on what to try. Thanks for any feedback!