Dmitri the mad scientist was having some trouble.
He was testing out his newest formula and things were not going well. The mixture blew up in his face. He spent three days cleaning his lab, thinking about what went wrong.
Then he went back to his blackboard to check his equation. He was shocked to find all the addition was changed to subtraction, the multiplication became division and even worse, the ounces were all changed to grams!
Dmitri almost pulled out all the hair out of his head. Then, he heard someone snickering behind his back. He turned around to see his cat, Katya, laughing at him with the chalk in her paws.