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: Two surfers in the ocean with one watching while the other in a green and black suit rides a wave in. Sentence 2: Surfers are on vacation in Hawaii.
Someone is surfing at the beach.

Sentence 1: Two skiers stand near a snowy mountain. Sentence 2: Tall humans standing

Some humans standing.