How often does it happen that a single tiny mistake causes an entire civilization to collapse? More often than you think! Readers of Jared Knott's book, Tiny Blunders/Big Disasters, will be amazed at the little things that changed history in a big way. Here are a few examples:

A single document poorly designed by one single clerk in one single county changed the outcome of a presidential election and led directly to a major war.
A soldier accidentally kicks a helmet off of the top of a wall and causes an empire to collapse.
A small mechanical device several inches long fails to function, which changes the outcome of WWII and leads to the death of millions of people.
A man fails to gather his army in time to defend against an attack because of the temptation of opium and a young slave woman.
And many more!