Joshua would be Saint Joshua of the Scientific. He'd attract nutty scientists, college students frustrated with their exams, and people who've lost their families. Devotion to him would include going out and testing something. Or hugging your family, chosen or otherwise.

Helena, the father patron saint of science-fiction novels. She'd attract all frustrated authors, probably also casual ficcers, and anyone who loves mentally living in fantastical worlds. Devotion would include writing, plotting, creating.