At choice moments throughout time, individuals have
posed new ideas or theories that have gone against
the grain. Someone decided what is known is not enough
and asked—sometimes demanded—that the world look
at an issue, circumstance, or traditional method in a whole
new way. The story of humanity is rife with such turning
points. Some have begun as small changes but reverberated,
building in strength until their impact on the world
became tremendous. Others were so essential that they
were expressed almost immediately on a global scale.