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5:30 AM
 
 
2 hours later…
7:30 AM
@XKCD XKCD #2918 Explained: This comic provides the reader with a suggestion on how to "conceal activity" that is going to be graphed over time; by timing bursts of activity with the ticks on the time axis. This is assuming that the scale of the time axis is known, and that the "bottom" of the graph coincides with the line on which the ticks are drawn, rather than the "peak" of the largest tick.
 

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