Images hint at seeds of a giant galaxy. A cluster of observations poses puzzle. More evidence of a lumpy universe. When two twisty molecules hook up to form a knot, both mathematicians and chemists have something to cheer about. Molecular composite knots.
Chemists learn to knot their molecules.
Cipra, B. 1992. Peterson, I. 1992. Skerrett, P.J. 1994. The ties that bind. A prospective study of cigarette smoking and the risk of age-related macular degeneration in men.