Nerdable on MSN9mon
15 Hardest Math Problems In The World (Unsolved)
Nevertheless, this problem has continued to puzzle mathematicians for ... These are some of the hardest math problems in the ...
Newser on MSN1mon
'History's Hardest Puzzle' Continues to Elude
The ancient Voynich manuscript, of course, which just might be "history's hardest puzzle," writes Ariel Sabar ... it in 1912 ...