Circular Saw- Tabitha Babbitt (1810)
She observed men cutting wood with a pit saw, which is a two-handled saw that requires two men to pull it back and forth.
Though the saw is pulled both ways, it only cuts wood when it's pulled forward; the return stroke is useless.
To Babbitt, that was wasted energy
, so she created a prototype of the circular saw that would go on to be used in saw mills.
Chocolate Chip Cookies-Ruth Wakefield (1930)
She took a Nestle chocolate bar, crumbled it into pieces and threw it into her batter, expecting the chocolate pieces to melt during baking.
Instead, the chocolate held its shape
, and the chocolate chip cookie was born.
Liquid Paper-Bette Nesmith Graham(1950)
Retyping entire pages
because of one tiny mistake
, as the new model's carbon ribbon made it difficult to correct errors in typewriters.
A water-based tempera paint with dye that matched her stationary and, using a fine watercolor brush, she was able to quickly correct her errors.
The Compiler and COBOL Computer Language- 1950s, Admiral Hopper
She invented the compiler
, which translates English commands into computer code.
Admiral Hopper also oversaw the development of the Common Business-Oriented Language (COBOL)
, one of the first computer programming languages.
Colored Flare System- Martha Coston
The Square-bottomed Paper Bag-Margaret Knight
Windshield Wiper-Mary Anderson
Nystatin(effective fungus-killing drug)-Hazen in 1950.
Kevlar-Stephanie Kwolek 1964