What if Napoleon had won at Waterloo in 1815?
What if George Washington had accepted the offer to become King of America?
What if Aristotle's works had been lost to history?
What if Alexander had not died young and continued his conquests into Europe?
What if Darwin had never sailed on the HMS Beagle?
What if Caesar had not been assassinated on the Ides of March?
What if Einstein had stayed in Germany during the rise of the Nazis?
What if Socrates had written his philosophies down himself?
What if Tesla had succeeded in building his Wardenclyffe Tower project?