, Materials Science undergraduate, Batman and Doctor Who fanatic. Yes, he has at least two degrees. He mentions it to Rita in The God Complex. I don't have a video link to the same but this would help:
DEET (chemical name N,N-diethyl-meta-toluamide) is used as the active ingredient in many insect repellents. Insect repellents that contain DEET offer the best protection against mosquito bites.DEET is designed for direct application to skin to repel insects, rather than kill them.EET (chemical name N,N-diethyl-meta-toluamide) is used as the active ingredient in many insect repellents. Insect repellents that contain DEET offer the best protection against mosquito bites.
Definition of soot. : a black substance formed by combustion or separated from fuel during combustion, rising in fine particles, and adhering to the sides of the chimney or pipe conveying the smoke; especially : the fine powder consisting chiefly of carbon that colors smoke.