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


question:
Sentence1: Evaporation of sweat uses energy, and the energy comes from body heat. 
Sentence2: Evaporation of sweat uses energy, and the energy comes from exercise.
answer:
Evaporation


question:
Sentence1: Thermal energy transfer occurs by conduction, convection, and radiation. 
Sentence2: When a cooler object touches a warmer object, thermal energy transfers.
answer:

Thermal