The first shots were fired at Lexington, but the first documented occasion on which colonial minutemen were ordered to fire upon British soldiers (and did) was on the North Bridge at Concord. That was what many would point to as the first official act of outright treason committed by the colonists and marked the beginning of open, violent rebellion in Massachusetts.

They’re also pretty easy to use with Google Slides or Pear Deck or whatever technological platform makes you tingle, and work equally well for synchronous or asynchronous discussion. They're especially useful when you need ideas for "e-learning" on snow days, or when you’re huddled at home hiding from the coronavirus and wondering if you’ll have to throw out the bottled water and granola bars you left in your desk three months ago when you assumed we’d be back in a few weeks and god I need a haircut...