S1, E2: Josh Altman’s photos that proved new brain cells are created, even in adult brains; Andreas Vesalius’ drawings of the inside of the human body; Darwin’s theory of evolution summarized as a sketch; Rosalind Franklin’s and Raymond Gosling’s “Photo 51,” which became the decisive clue in the search for the structure of DNA; Carl Anderson’s photo of the positron, which revealed the world of antimatter.