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Most of us have seen someone working with a circular saw ... even if only on TV. Well believe it or not a woman invented it.
Tabbitha Babbit belonged to a Shaker community in Massachusetts. She was a weaver. In 1810, while wathcing the men of her community saw wood with this big two-man saw, she got an idea ... if the saw was circular it would be more efficient. She attached a saw to her spinning machine and - bada bing bada boom - a circular saw was born.
This picture is from: http://www.herstorynetwork.com/thank-woman/tabitha-babbitt/