Brave New World doesn't suggest that this kind of engineering was successful in terms of making people better, only that it led to a controllable world in which

Brave New World doesn't suggest that this kind of engineering was successful in terms of making people better, only that it led to a controllable world in which happiness took precedence over truth. A country that achieves what is described in the book will almost certainly fail to compete with countries that reward creative endeavours and free thought.