To research some well known fact and to announce it as though it is new and earth shaking is an art only some posses.
Becoming engrossed in a good book or a crossword really can block the ability to hear, a study has found.
Scientists demonstrated that when someone focuses their full attention on something, they can become deaf to normally audible sounds.
It happens because visual and hearing senses are trying to share limited brain capacity, they said.
http://www.dailymail.co.uk/sciencetech/article-1391373/How-reading-doing-crosswords-block-ability-hear.html#ixzz1NXjBplWB