The TARDIS is a marvellous device, and is actually bigger on the inside than the outside. But the TARDIS is not unique in this respect. For instance it is possible for people to be bigger on the inside too.
Meet Toby, a sweet eight month old boy. Like the TARDIS he is actually bigger on the inside. "Proof", I hear you cry. The proof came on 5th May 2008 when Toby demonstrated to Max just how big his insides were.
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:-)