Jim R. asks: Why is it “righty tighty, lefty loosey” with screws? One of the six simple machines, a screw is nothing more than an inclined plane wrapped around a center pole. While today screws come in standard sizes, and typically are tightened by turning clockwise (and loosened by turning counterclockwise), this is a recent invention. A great example of … Continue reading Why Do Screws Tighten Clockwise?