Is every living thing on Earth related?

We're distantly related, you and I. Somewhere deep in the past, the two of us share a common ancestor. The same can be said for us and chimps. Or chimps and alligators. But what about alligators and sycamore trees? Or humans and Tyrannosaurus rex? Are you and I, as paleontology expert Brian Switek puts it, distant… » 11/30/12 12:28pm 11/30/12 12:28pm