Anecdote: Three runners showed up in minutes at 4am when someone on my street suffered a cardiac arrest, beating the ambulance by +5 minutes.

There are so many ways to be cynical about the 4% to 16% improvement, but I think this is the most important takeaway:

> “The patient is dead” — meaning his or heart has stopped due to cardiac arrest — “and if you don’t do anything, 9 out of 10 will be dead forever,” he said.