Pick up your pen and draw a rushing train, or a sprinting cheetah. Which way is it facing? Peter Walker, a psychologist at Lancaster University, scanned Google Images for pictures of things in motion and compared them to images of those same things at rest. In a paper recently published in the journal Perception, he found that when it comes to pictures of rapidly moving scenes, people have a preference for those that go from left to right, not right to left. Though the reasons are still unclear, Walker suspects that the preference may have its origin in handedness. He describes the project in this week’s One Last Thing.