Pop quiz: Is this ...
1. A black thread on a really badly tended carpet, like the one in this crappy old house I used to rent?
2. An aerial photo of a lonely road in the desert, geeked up with all kinds of Instagram filters?
3. My final functioning neural pathway, floating in a brown paste of overcooked brain cells thanks to the July heat?
Answer: While all three are entirely plausible, and No. 3 is undoubtedly accurate, the correct answer is No. 2.
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