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: bacteria cause food to spoil. 
Sentence2: Food poisoning occurs when spoiled food is eaten.
answer:
spoil


question:
Sentence1: wind is used for producing electricity. 
Sentence2: Winds are caused by pressure differences.
answer:
wind


question:
Sentence1: heating an egg causes a chemical reaction in the egg. 
Sentence2: Insects hatch from eggs.
answer:

egg