@chloefcotter: cain's jawbone, 1934, written by the man who set the observer's crosswords. 100 pages printed out of order, six murders buried inside, and you can't solve them until you've got the sequence right. 100 pages can be arranged about 10^157 ways. there are roughly 10^80 atoms in the observable universe 🤯 #literaryhistory #bookfacts #cainsjawbone