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: Interest in fossils is worldwide. 
Sentence2: paleontologists study something with worldwide interest.

A: Interest
****
Q: Sentence1: Combustion generates toxic fumes. 
Sentence2: High temperatures can cause toxic fumes.

A: fumes
****
Q: Sentence1: melting is when solids are heated above their melting point. 
Sentence2: melting rocks forms magma.

A:
melting
****