What is normal or socially acceptable right now but may be seen as discrimination in the future?

How women get paid less than men.

Explanation: This is very common even now. For every 1$ a man makes a woman makes 82 cents.

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.

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