Actually, so am I. Lets go through it together:

1) "Implementation of Darwin" [1]

2) "On top of the Linux kernel" [2]

3) "Binary compatible with iOS 5.0" [3]

4) "The final goal is probably recreating the iPhone OS 1.0 stack" [4]

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[1] "Darwin forms the core set of components upon which Mac OS X and iOS are based"

http://en.wikipedia.org/wiki/Darwin_(operating_system)

[2] "The main component of most computer operating systems"

http://en.wikipedia.org/wiki/Kernel_(computing)

[3] "In computing, a computer that can run the same binary code intended to be run on another computer is said to be binary-compatible"

http://en.wikipedia.org/wiki/Binary_code_compatibility

[4] "Initial OS release".

http://en.wikipedia.org/wiki/IOS_version_history#iOS_1.x:_in...