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: Electrical currents cause magnetic fields. 
Sentence2: Electrical currents can cause objects to repel each other.
answer:
Electrical


question:
Sentence1: Most water comes from precipitation. 
Sentence2: aquatic animals require precipitation to survive.
answer:
precipitation


question:
Sentence1: a telescope is used for observing stars by astronomers. 
Sentence2: Astronomers use telescopes to study black holes.
answer:

astronomers