This isn't rocket science, this is “Si”ence! Hey, this guy's been around the block a few times and he knows what he's talking about. You may doubt him now, but if he says it's “Si”-intistic stuff, there's a chance that he's right. Of course, that doesn't always mean it's a good chance, but who cares? If you're a fan of this loveable character, why not show it off in style with this officially licensed Duck Dynasty t-shirt! This Si Robertson t-shirt is the perfect choice for any die hard fan.