From: Su Zhang <zhangsu@...>
Date: 2011-01-26T14:12:08+09:00
Subject: Re: module_function and Object include.

"Including a module in Object class" simply makes every object respond 
to the  mixed-in methods.

In your case, `greet' is made available as an instance method of Object. 
The class `Greeter' is derived directly from `Object', thus also 
inherits the instance method 'greet'. Furthermore, the class `Greeter' 
itself is an object of type `Class', which inherits from `Object' too, 
so 'Greeter' itself (without the presence of any instance of it) also 
responds to 'greet'.

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