TASK DEFINITION: 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.
PROBLEM: Sentence1: microbial fuel cells convert chemical energy into electrical energy. 
Sentence2: microbial fuel cells convert chemical energy into kinetic energy.

SOLUTION: cells

PROBLEM: Sentence1: if humans disturb animals in a location then those animals will move to a different location. 
Sentence2: The human being is self-aware.

SOLUTION: humans

PROBLEM: Sentence1: Bacteria may spread directly from one person to another. 
Sentence2: Bacteria are yet another type of microbial control agent.

SOLUTION:
Bacteria