Tom Scott
The Effective Power Bug: Why Can Weird Text Crash Your iPhone? (2015x23)
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There are all sorts of theories about why a string of weird, mostly-Arabic text can crash your iPhone. I've hunted through them, summarised the ones that seemed plausible, and the first part of this is a run-down of what's going on. The second part: well, I'm going to take a punt at explaining why Arabic, in particular, causes this bug -- and hopefully we'll see if I'm right or wrong soon!