Get your students reading about careers in science (and earning a few extra credit points in the process.)
I made two-sided copies and kept a stack of these scientist profile sheets next to my Sally Ride "Cool Careers in Science" book series. Any time a student finished early with an assignment, I encouraged them to read a Cool Careers profile.
I also used this sheet as a class-wide "everybody read two profiles" assignment when substitutes were in the room. (An excellent follow-up to this class-wide activity is to have students pass their profile sheets to a neighbor and discuss it, then share out with the class. (This kept students accountable for writing an informative profile, not merely jotting down a few superficial facts).