Evem with IEEE things aren't that simple: http://randomascii.wordpress.com/2012/03/21/intermediate-floating-point-precision/
Perhaps it was the fear of what happened to HBGary with Anonymous.
It's a planet from Star Wars of course.
C++ and OpenGL are both platform agnostic, why do you need the tutorial to be for a specific platform? Perhaps you need a tutorial on how to use your toolchain to compile C++ and OpenGL programs or linux?