Is Bill Gates a mammal?

Is William Henry "Bill" Gates III (born October 28, 1955), the American business magnate, computer programmer and philanthropist a Mammal (Mammals, the class of vertebrate animals characterized by the presence of sweat glands, including sweat glands modified for milk production, hair, three middle ear bones used in hearing, and a neocortex region in the brain)?

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Show reasoning Reasoning

I followed this chain of reasoning:

By calculation (generator: ["now@trueknowledge.com"]) I know that:
The current time is May 21st 2013, 17:17:55

I know from locally stored knowledge that:
Fact 1: Bill Gates is a person ([fact: ["19249343@trueknowledge.com"]])

By calculation (generator: ["permanent@trueknowledge.com"]) I know that:
Fact 1 is true for all time

I know from locally stored knowledge that:
person is a subclass of mammal ([fact: ["1131347@trueknowledge.com"]])

permanent applies to person ([fact: ["1131338@trueknowledge.com"]])

By calculation (generator: ["iaif1@trueknowledge.com"]) I know that:
Fact 2: Bill Gates is a mammal

Fact 2 is true for all time

By calculation (generator: ["timeperiodtopoint@trueknowledge.com"]) I know that:
Fact 2 is true at May 21st 2013, 17:17:55

I used the following facts to provide this answer:

Bill Gates is a person

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