Picture Books and Primary Sources: Lines, Bars and Circles: How William Playfair Invented Graphs by Helaine Becker and Marie-Eve Tremblay | Knowledge Quest
There are certainly historically based picture books about inventions that I’ve read before, but none may have surprised me more than Helaine Becker’s Lines, Bars and Circles. I had never attributed the creation of the line, bar, and circle graphs... Read More ›