A prehistoric man was living alone in a cave when one day a woman showed up.

“Can I move in with you?” she asked.

“What for?”

“I’ll keep the cave clean.”

“It’s already clean.”

“I’ll cook for you.”

“I’ve already killed and roasted a mammoth. That’s dinner.”

“Just let me stay one night. You’ll see.”

The man thought it over and let her in.

They spent the night together in the cave. The next morning, he stepped outside, stretched, looked down between his legs, and said…

purrfect science