Thumpa-thumpa, thumpa-thumpa, bump, thumpa, skip, thumpa-thump, pause ... My heart wasn't supposed to be beating like this. Way too fast, with bumps, pauses, and skips. On my smart watch, my pulse was topping out at 210 beats per minute and jumping every which way as my chest tightened. Was I having a heart attack? The...

This is today's edition ofThe Download,our weekday newsletter that provides a daily dose of what's going on in the world of technology. The arrhythmia of our current age Arrhythmia means the heart beats, but not in proper time-a critical rhythm of life suddenly going rogue and unpredictable. It's frightening to experience, but what if it's...