Howell says that regardless of whether evolution is a fact, it has been helpful. The scientist is really interested in the usefulness of a theory, not so much its ultimate truth. The important thing in my field about the concept of evolution is its practicality. The ideas for various concepts of intelligence have come from chimps and monkeys. It turns out studying intelligence and mental illness in humans can be done through animals.
Scientists can control the studies better.
You don't have to get into whether animals or humans come from the same line. I don't even care about that. I care about the practical value. He has no question about the practical value of computers, just one of the many changes he's seen on campus during his 44 years. With today's computers I could do them in six hours.