Title text:
I’ve had countless nights where the line never left the bottom zone of the graph, but the few moments where it’s climbed all the way to the top have made up for them all.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3196/
Unfortunately I’m about 13° latitude farther south, so it’s much harder to see them normally