In cities, wealthier neighbourhoods have a greater diversity of indoor arthropods. So next time when you see some weird bugs in your house, just take it as an unfortunate side effect of possibly living in a posher area!
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Further reading:
http://rsbl.royalsocietypublishing.org/content/12/8/20160322
https://peerj.com/articles/1582/
the Runaway Lab Book 