as in kanpur(up) city and other city there has a electric light problem in examination time that student always get unable to study there book in night so their may be other option , we can use that print on book which can also shine in night (as radium can shine in dark), means if publisher will use radium like ink for printing then student may get relief in dark for studing.................
Saurabh Nigam
Kanpur
Saurabh Nigam
Kanpur
