For an experiment, a chemistry teacher takes out a $20 bill

For an experiment, a chemistry teacher takes out a $20 bill and put it’s in a bottle of ethanol. He then ask his students if it will dissolve.

*A student raise his hand to answer.*

Student: No it won’t dissolve sir.

Teacher: Really good! Now can you explain to the rest of the class why?

Student: You’re so cheap, there’s no way you would’ve sacrificed that $20.

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