Title text:
Turning in other directions can be accomplished by using a magnetized centerboard and ocean currents, since a current flowing through a magnetic field induces a Laplace force.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3090/
Ah, thanks for clarifying. I never knew about the hover text. I just viewed the source page on my desktop browser and now I see it. However, is this text even viewable on mobile, when you don't have a cursor to hover?
E: Now that I've read the hover text on my desktop, I've noticed that it's the same as the text added to the post by the bot. I really like this implementation with the image linked alone. When the post is viewed on mobile, all text is viewable and the full comic is shown legibly.
The mobile browsers I've used let you long-press the image to see the hover text.
If yours doesn't, you can always prepend
m.to the domain name, like this: https://m.xkcd.com/3090/Thanks for the tip!