Down the drain with Archimedes

Talking to McKay about his day at school today while we ate dinner.

R: What did you do at group time?
M: We checked to see what stuff would sink and what stuff would float...
Big stuff will float, but the little ones always sink.
R: Really? So by floating, you mean, goes to the bottom of the water?
M: No (with much disdain) floating means ONTOP of the water.
R: Oh.
R: Well, what floated?
M: The really really big blocks, and the little tiny marbles sank.
R: Oh.

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