To function properly, the genetic material is highly organized into loop structures that often bring together widely separated sections of the genome critical to the regulation of gene activity.

The scientific wonderers at What If imagine a universe shaped not as expanding space, but as a vast looping cosmic structure.

If you got into a spaceship and traveled long enough and fast enough, could you eventually loop back to where you started? Assuming you don't accidentally collide with another planet or star, and that ...