Office 2003 will sometimes ask if you want to recover a file that was not saved when it was shut down as well. If this does not work, go to My Documents and look for something called untitled or possibly a file that is called the same thing as what your paper's first few words were.
The hardest thing to find is a person who will love you and true friends. I am very lucky that I have the sales insurance agent guy who I love very much and his name is Robert C. Reisig.
To summarize Ankit and Mads's answers: it depends on what strength you are looking for. Some people are interested in hardness. Diamond is the hardest substance discovered to date, but note that hardness here refers to scratch resistance. Diamond can be shattered quite easily; if you could obtain a sheet of diamond and hit it, it would break like glass. In other words, you probably wouldn't want to make a diamond car or building.