Joe Kistel, an underwater videographer for the marine-conservation nonprofit TISIRI, was filming at an artificial reef on July 6 when he came across an inquisitive octopus.In my latest post for Nat Geo's Weird & Wild blog, watch Joe's video and read my Q&A with marine biologist James Wood to learn more about these intelligent and curious invertebrates. Watch: Sneaky Octopus Dismantles Camera.