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Well... they've been known to study and use the environment to their advantage. Here's a link to what some of them have done. They also don't just have their brain in one spot. They have neurons reaching out to their tentacles. http://www.upworthy.com/13-of-the-most-frighteningly-smart-things-octopuses-can-do

Very interesting, thank you for that contribution. For some reason I always associated them with Jelly-fish without a brain or thinking organ. I've learnt something new again. Thanks!

I'm glad you found value in my comment.