my students like it when i name my charaters after them. they always want to know how old they are, how many kids they have, when they die, etc

some of them like having several characters named after them at the same time, so i always have lists of names when new kids are born.

and they like to see the graveyard with their names on the gravestones for some reason, and brag about how old they lived. they get really competitive about it sometimes.
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Why is it that if someone tells you that there are 1 billion stars in the universe you will believe them,
but if they tell you a wall has wet paint you will have to touch it to be sure?