I was pretty young when an assassin killed President John F. Kennedy, but I still have vivid memories of that day. At school, the principal called us all into the gym and said these very words: “The President has been shot.”

I also remember watching the funeral on television. I recall seeing the flag-draped coffin and the widowed First Lady with their two small children. And that riderless horse with the backwards boots on his saddle, symbolizing a fallen leader.