Pic­tures Con­sid­ered #26 by Christoph — In the late 1960s, read­ers of struc­tural bi­ol­ogy pa­pers were fre­quently con­fronted with (and con­fused by) elec­tron mi­cro­graphs of heav­ily in­ter­twined DNA mol­e­cules that re­sem­bled a hope­lessly tan­gled ball of wool. They were re­ally hard to "read" even for ex­perts, and pic­tures as the one con­sid­ered here were no­table ex­cep­tions...