What appear under an atomic force microscope to be tiny rings with little bits missing are actually nanoscopic rings made of double-stranded DNA with a little gap in the form of a short single-stranded fragment. Researchers have created nanoscopic rings made of double-stranded DNA with a little gap in the form of a short single-stranded fragment. This gap is a place to attach other molecules that have the potential to transform the rings into versatile nanocomposites for various applications.