One area where for my part I feel this definitely is an important point, is in the field of evolution versus creation. How many program do I not watch where the evolutionists state that earlier, one did not quite understand how this or that was - but NOW we know how it is, NOW we have the full truth about it. And then, in about 20 years' time, another evolutionist will say exactly the same. I don't intend to hijack the thread, but me - I get angry when I hear about how the plants and insects and worms have figured things out and miraculously managed to overcome obstacles and have engineered new solutions whereupon the tree next door has managed to overcome this etc. NOW we know it, a decade ago we didn't.
That's science for you - a constant search and discovery, with knowledge and theories being refined all the time. Exciting isn't it! Ever since the ancient greeks (and probably before) man has been striving for a better understanding of the world around him.