Just ahead of the Super Bowl, here's the fascinating science behind a football spiral, with input from a physics professor.

But the easiest way to explain it is to consider the Magnus effect. When a spinning ball moves through the air, it creates a force that makes it curve away from its straight-line path. Scientists ...

It had also developed a technique of spinning cables on-site. The Roebling crew's work on the Golden Gate Bridge continued a tradition of innovation. Cable spinning began in October 1935.