In this task, you're given a pair of sentences, sentence 1 and sentence 2, that neither agree with nor contradict each other. Your job is to alter sentence 2 so that the pair clearly contradict each other. Generated sentences must be short, with less than 15 words. New information can be introduced. Avoid using pronouns to confuse the subject of the sentence.

Sentence 1: A man with a shaved head and a button-up shirt looks into a microscope near a poster about red blood cells. Sentence 2: A scientist studies a vaccine.
A man without hair near a poster about red blood cells is looking through a microscope.

Sentence 1: Busy city street scene displaying pedestrians and automobile traffic. Sentence 2: Cars are stopped at a red light.
There are cars and people on a street.

Sentence 1: Man in blue shirt focusing on grilling hamburgers. Sentence 2: The man is making food for his family.
The person is cooking.