Thomas Phinney has solved type mysteries before -- see CreativePro.com's 2004 article on his investigation of memos relating to George W. Bush's Texas Air National Guard service.

He's at it again, this time inspecting a letter supposedly composed by Bob Hayes, an athlete who won fame in the 1960s as an Olympic sprinter and a wide receiver for the Dallas Cowboys.

To read the details on Phinney's analysis, and to see high-resolution photos of the letter itself, go to his new blog.