U.S. Commerce Dept. @CommerceGov
As we approach #WomensHistoryMonth, this is a great way to showcase women inventors and #WomenInSTEM! — PolitiTweet.org
USPTO @uspto
Born #OTD, Helen Murray Free is the inventor of the first dip-and-read test strips for use in diagnostic testing.… https://t.co/Qrn6R7AoZm