Which answer represents the correct chronological order of the following STEM inventions, from the earliest to the most recent discovery?

The circular saw dates to the early 19th century (often credited to Tabitha Babbitt around 1813). Talking dolls came later, in the 19th century; Blissymbol printers were developed in the 20th century, and the Summly app was created much more recently, in 2011. So the order from earliest to latest is circular saw, talking doll, Blissymbol printer, Summly app: choice D.

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