Renovating a tiled floor

Titled floors often loose their color after many years of use. The floors still remain a leveled surface. Had there been a technology to redo the coloring even with a different shade or pattern, renovation costs could be brought down. Finishing the renovation and making a dwelling habitable again could leave minimal carbon foot print.
However, high temperatures may be needed to do the job which asks for new thoughts of renovating such tiles. New technologies if made available could even make the floors look not divided into squares.

10/04/14
Looks like scientists are not far away from achieving this. Follow the news link:
http://article.wn.com/view/2014/04/07/Green_Cement_Made_From_Toilets_and_Bathtubs_May_be_Stronger_/

What Computers will always lack

Human ability to forget is one great gift from God. An entire book may be dedicated discussing this topic and yet leave many advantages of forgetting untouched. Computers having permanent memories will never have the ability to forget.

Would it be advantageous if the smart machines forget stuff and still be as reliable as they are today? The human race progresses much because of it's ability to forget. However, smart machines made by them will never be able to take advantage of such a God given character.

Another human ability is the ability to doubt. Doubt makes a person think like no other factor. ver a Would a doubting computer be smart like a human?