The Mainspring of Human Progress
HENRY GRADY WEAVER
FOR SIX THOUSAND YEARS ~DIED OF HUNGER.
WHY DON'T WE?
This is the basic question dealt with in MAINSPRING.
But the attempt to find the answer leads into a wide range
of subjects, such as:
• What is the greatest of all our modern inventions?
• Who invented ¥¥~¢ (0) and why?
• Just what is the difference between a ~~public and
• What simple invention contributed most to our
254-The Mainspring of Human Progress Beth Bowlby Correspondence.pdf