The way Susan refers to it, as in "I won't leave the 20th century" has always implied to me that Susan was born on earth, although she must be at least half Gallifreyan.
That was the first time the chameleon circuit failed to work (there is some archive note about the idea behind it - which was to keep costs down)
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That was the first time the chameleon circuit failed to work (there is some archive note about the idea behind it - which was to keep costs down)