I’d like toshake the hand of and express my thanks to, say, Mary Anderson (1886–1953) of Greene County, Alabama, for inventing the windshield wiper blade that allows us to drive safely in the rain; Ruth Graves Wakefield (1903–1977) of Easton, Massachusetts, for enriching our lives by inventing . . . yes . . . chocolate chip cookies; or Dr. Barbara McClintock, who, by studying corn, discovered the way that genes move along the chromosome and cause mutations and other characteristic changes.