What were the four things momma always used to talk about to Bud about?

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Explanation:

1) About the picture her dad made her take with the filthy hat

2)His name is Bud, not Buddy

3) Told him not to worry and that she would explain things to him when he was older

4) When the door closes another opens

onto a large boat, and mark the water level that the boat sinks to. then, take the elephant out and put a bunch of marked weights onto the boat until it reaches the same water level. add up the masses of the weights to get the weight of the elephant.