Lines, Bars and Circles: How William Playfair Invented Graphs
[…]
Lines, Bars and Circles: How William Playfair Invented Graphs Read More »
Inventions
Sky Sailors: True Stories of the Balloon Era
aeronauts, balloons, ballooning, transportation, parachutes, history of ballooning, sky sailors, pyrochtechnics, adventure, history, science
Sky Sailors: True Stories of the Balloon Era Read More »