ANCIENT BOOKS
'(<a href="http://www.j-archive.com/media/2009-02-26_J_02.jpg" target="_blank">Sarah of the Clue Crew shows a geometric diagram on the monitor.</a>)  The complex bridge of fools proof showing that the angles at the base of an isosceles triangle are equal is the point beyond which only very clever students are said to go in this book by Euclid'
The Elements