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Title text for them smartphone users: In Universe Pro®™ the laws of physics remain unchanged under time reversal, to maintain backward compatibility.

xkcd explained link: https://explainxkcd.com/2666

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On Firefox for Android, you can just press-and-hold the image to see the alt-text, or https://m.xkcd.com has "alt-text" that you can tap on to toggle it.

Same behavior on iOS Safari

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