TASK DEFINITION: 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.
PROBLEM: Sentence1: Insects have 2 antennae. 
Sentence2: Insects have 2 appendages to detect sound.

SOLUTION: 2

PROBLEM: Sentence1: Tree-ring dating the 1700 Cascadia earthquake. 
Sentence2: estimating the age of trees can be used in reviewing earthquake history.

SOLUTION: earthquake

PROBLEM: Sentence1: Blood carries oxygen to the brain. 
Sentence2: brain cells die quickly if blood is cut off.

SOLUTION:
Blood