The first jeans, made by Levi Strauss & Co., were invented in which year?

1873

Explanation:

The next time you see someone wearing a pair of Levi's® jeans, remember that these pants are a direct descendant of that first pair made back in 1873. That year, two visionary immigrants — Levi Strauss and Jacob Davis — turned denim, thread and a little metal into what has become the most popular apparel on earth.

1873

Explanation:

They were invented by Jacob Davis and Levi Strauss in 1873 and a worn still but in a different context. Jeans are named after the city of Genoa in Italy, a place where cotton corduroy, called either jean or jeane, was manufactured.

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue