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I have only one problem with the calibration movies. They help to train our minds to notice and identify tracks that were created in a lab. The real tracks may be entirely different and maybe there something we do not know yet. During the tutorial it explains this, but I would just like to reiterate that there are numerous potentialities here so keep a look out for anything strange, anything at all different or peculiar. You shouldn't just look for the tracks, but anything that might be something interesting or unusual.