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The Doctor took us to a Bar Mitzvah on Long Island. "It's a coming-of-age ritual."
I said "Mazel tov!" to the Bar Mitzvah boy (I have Jewish friends in Brisbane).
Nyssa was baffled. "He's a man now?"
"Yes, at thirteen."
I added, "But he can't drive, drink, vote, consent to sex, acquire credit or live on his own. He's still considered a child."
The Doctor explained, "The human brain takes twenty-five years to mature."
"On Traken, the pre-frontal cortex is fully formed at thirteen. Was, I mean."
"Nyssa, you're the maturest person here."
The Doctor looked put out. How immature!