instruction:
Generate an overlapping word between the given two sentences. When you find the overlapping words, they don't have to match exactly, e.g., "survival" and "survive" are valid overlapping words. Little words like "the" or "of" don't count! You must generate significant words which are not the stop words.
question:
Sentence1: Mad Cow disease is a concern. 
Sentence2: pathogens can cause Mad Cow.
answer:
Cow


question:
Sentence1: microbial fuel cells convert chemical energy into electrical energy. 
Sentence2: microbial fuel cells convert chemical energy into kinetic energy.
answer:
cells


question:
Sentence1: producing thrust causes something to move. 
Sentence2: Then the engine spins up and starts producing thrust.
answer:

producing