Human knowledge centered entirely on the material world

It is a sad thing that our species focuses entirely on material things. Apart from the claims of various religions all actual knowledge (especially scientific) looks at only the things we can see, touch, feel and hear. While there may be no way of knowing if such a material world is all there is it would seem more than possible that there may be other worlds that we simply cannot connect with using our human senses. While there have been, thus far, no absolutely provable examples of spiritual life it would seem likely that many things exist, in one form or another, quite apart from our scientifically established world.