> Science historian Alistair Sponsel of the Science History Institute and crystallographer Brian Sutton of KCL argue Franklin knew the earlier photo had revealed a helix—the epiphany Watson claimed for himself—and that is precisely why she made a second, more refined version, photograph 51.

It was Watson and Crick who discovered the double helix, even if Franklin did write something down about a single helix from a previous photo that they didn't read.