On Tuesday this week, I was asked to look at a centrifuge (I like the variety). It turns out that there were two of them (of three) that were broken - they didn't turn on. I looked at one of them and all that the motor needed was some brushes/carbon so I took some extras that fit closely and it worked. The other one was a bit more complicated, I took it apart and saw that there was a short against the metal case - one of the wires had broken insulation. I repaired the wire and it worked again.
Here is a picture of a very pretty caterpillar that one of the kids found:
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