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: melting is when solids are heated above their melting point. 
Sentence2: Ice is a solid, it's cold and it's hard.

A: solids
****
Q: Sentence1: Conventional myosin is required for cytokinesis . 
Sentence2: Conventional myosin is required for the final stage of cell division.

A: Conventional
****
Q: Sentence1: RNA is a small molecule that can squeeze through pores in the nuclear membrane. 
Sentence2: ribonucleic acid is a small molecule that squeezes through pores in the nuclear membrane.

A:
membrane
****