You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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.

Sentence1: pesticides cause pollution. 
Sentence2: pollution can harm animals.
Solution: pollution.
Why? The word "pollution" is common to Sentence1 and Sentence2. So, it's a good answer.

New input: Sentence1: Time is just another dimension in the Physical Universe. 
Sentence2: Seconds measure a dimension of the physical universe.
Solution:
Physical