In the past, we used to rely on artists to bring us into the mysterious world of biology. In the 1500s Leonardo da Vinci revealed the glories of human anatomy. And around 1900, a German biologist named Ernst Haeckel used his incredible drawings of microbes and larger creatures to promote his ideas about evolution. The public loved Haeckel’s work, but as Sarah Lilley reports, the artist in Haeckel eventually came into conflict with the scientist.