A bookmark that is made of either lead or depleted uranium, and has some sort of clip to hold it to pages. When I turn the next page I clip it under the weighted bookmark and the page will not flip back over while I'm trying to read it.
-- DIYMatt, Apr 29 2010

A Geiger counter would also allow you to find where you put your current book with the depleted uranium version.
-- Aristotle, Apr 29 2010


With the soft lead version you could take your book to read on fishing outtings and tear off small strips to use as casting weights. Now it's a tri-purpose accessory.
-- jurist, Apr 29 2010


Oh.

I thought this bookmark would be inserted in different manners indicating how interesting the book was when you put it down.
-- normzone, Apr 29 2010



random, halfbakery