Critical Plan B

It's always important to have plan B, because there's a chance that plan A can fail, it will fail, and then you need to plan B.

For instance, some apps just keep crashing on the iOS5 Beta, so I always download multiple version of the same kind of app, so that if I failed, I can use the other.  Like I was reading the sample of the book "the Girl who kicked the hornet's nest" on Nook, and it kept crashing when I tried to get the definition of words.  So I switched to the Amazon app, download the sample book, and found it worked nicely.  Once again, plan B wins.