Because he wanted to have someone to share the workload with—and to finally have someone who could understand his experiments without needing an explanation!
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The answer to the joke on page 11.5 of the Punchline Algebra book B is that the deck of cards was always in trouble because it was "decked out" or "dealt with" too many issues. This play on words uses the dual meanings of "deck" and the card-related context to create humor.
Say as if I were a scientist. I am trying to create something that will cure cancer. If I miscalculate and do the wrong things I could probably make something more worse than it was before.