Identifying Markers: Marine Mammals vs. Minivans, or, “The OTHER 50 Shades of Grey”

Lookalikes?  Not to Their Owners Supposedly, marine biologists can distinguish amongst very similar-looking dophins, whales, and walruses by their distinctive markings. In the same way, I can identify my family’s slate gray minivan — in a sea of near-identical gray minivans — by its distinctive pattern of dings and scuffs. Exception:  Newborns The principle even...
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