After the visit to ROM ( Royal Ontario Museum), Caleb is fancinated by dianosors and has been asking questions that I could not answer immediately: where were we when dianosors were alive? Why did dianosors disappear?
Me: Dianosor might be disappeared because the big fire on earth caused by a space rock killed all the plants and dianosors had nothing to eat.
Caleb: where were the firemen and fire truck?
Me: Oh, there was no human being at that time.
Caleb: what about dianosor's fire engines? where were they?
(he seemed to get into fire and fire engine... )
Me: fire engines was invented and used by human being, dianosors did not have fire engines.
Caleb: what does "invented" mean?
Me: .....
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