On this day in 1924, Bette Nesmith Graham was born. Who, you ask? In the 1950s, she lived in Texas and worked in a bank. But to show you how much things have changed, the highest position in the bank that was open to women was executive secretary—the position that Graham held. But to supplement her earnings, she painted the windows of the bank during holidays. Remember when they did that? It was cool.

Anyway, the point is that Graham was an artist and a secretary. And she realized that rather than erasing mistakes, which is what typists did, it would be better to do what artists did: paint over them. She later said, “So I decided to use what artists use. I put some tempera water-based paint in a bottle and took my watercolor brush to the office. I used that to correct my mistakes.” She had invented liquid paper.

She didn’t do anything with the invention for five years other than use it. Although her bosses didn’t like it to be used, it became popular with other secretaries at the bank. And in a detail right out of a very boring Breaking Bad spin-off, she worked with her son’s chemistry teacher to improve it. Eventually, she started a business and employed 200 people. And she sold the company to Gillette shortly before she died. She is a true entrepreneur.

Happy birthday Bette Nesmith Graham!