So my students were doing a lab this morning and they were supposed to dry their sand samples on Tuesday so they could sieve them today. Only, one group didn't - so they asked if they could microwave it dry. I said sure (much to their total amazement) and they went to the cafeteria. They came back a while later reporting that 5 minutes on high was plenty to dry it out. And they were amazed it worked - I don't know why.
So then another group forgot which sample was theirs so they went to dry a new sample too. Only, the girl returned in a minute saying that it started sparking and almost blew up the microwave. Turns out she had a big chunk of lignite (coal) in her sample. Ha! Could you imagine if my students would have blown up the microwave? I laughed for a while, but she was less than thrilled.
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