These smudges may appear to change brightness or size over time.
Change to
These smudges may appear to change brightness, size and position over time.
The help text can be found by clicking on the "Need some help with this task?" link in the classify screen. The section is headlined "non-mover (false positive) examples"
Add "position" to the phrase
Change to
The help text can be found by clicking on the "Need some help with this task?" link in the classify screen. The section is headlined "non-mover (false positive) examples"