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.

Q: Sentence1: Heat and temperature are the same. 
Sentence2: a thermometer is used to measure heat.

A: Heat
****
Q: Sentence1: Genetics is the study and application of principles of inheritance to plants and animals . 
Sentence2: Pedigrees are useful tools for studying Genetics.

A: Genetics
****
Q: Sentence1: conserving resources has a positive impact on the environment. 
Sentence2: Recycled products have a positive impact on the environment.

A:
environment
****