Ok, bear with me on this because the category for the suspect I would like to guess is "Read a book that involves time travel or has a character involved in STEM."
I am going to use Ed Yong's books I Contain Multitudes for this card. The main characters in this non-fiction work are without question the various types of microbes that Yong introduces the reader to, but there is one that really stands out - Wolbachia.
The deliberate introduction of Wolbachia to mosquitoes is currently being considered for hemming the spread of Zika and dengue viruses.
So, I am regarding Wolbachia as characters involved in STEM (tho, of course, any of the scientists featured by Yong would qualify, too).
My guess for Suspect: