The most important thing -- Health

It is such a shocking and sad news for me to know the sudden death of an elementary school friend.
I was told that he died of blood blocks in brain ( do not know the medical name ). It is such a painful feeling for his family. Without knowing why and how he could develop such disease, I realized again that living in a healthy life style and doing exercise are so important.

Dianosor

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: .....