Traumatic experiences, life stressors, changes in the environment, encountering the fear in a different context are some of the factors that can trigger and reactivate the phobia. are experts at surviving indoors, hiding in kitchen pipes or musty drawers. But a new study published on Monday in the journal Proceedings of the National Academy of Science s shows they didn't start that way.
“It’s not just an insect story,” said Stephen Richards, an assistant professor at Baylor College of Medicine in the US state of Texas, who studies insect genes and was not involved with the study. “It’s an insect and humanity story.”Researchers analyzed the genes of over 280 cockroaches from 17 countries and six continents. They confirmed that the German cockroach — a species found worldwide — originated in southeast Asia, likely evolving from the Asian cockroach around 2,100 years ago.
Once they arrived, inventions like the steam engine and indoor plumbing likely helped the insects travel further and get cosy living indoors, where they are most commonly found today.
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