News You Can Bruise for 2005 April 21

What is up with the really cheap, thin paper used in mass market paperbacks published in the 60s and 70s? I got a used 1972 copy of The Sot-Weed Factor and it's about as thick as any other paperback novel, but it turns out that's just because the pages are one micron thick. It's actually as long as (and more obscure than) frickin' Quicksilver.