There are many forms of long QT syndrome, a rare heart condition. But one in particular can cause death in response to a sudden loud sound or a fright. This was a quick video, knocked up from concept to online in a few hours.
The latest Apple Watch features a pretty amazing ECG feature which boasts the ability to detect abnormal rhythms. I put the science under the microscope - and took a look at the momentous implications. This changes everything.
This was a bonus that absolutely made all the effort worthwhile. For those that don't know, John Mandrola is the voice of cardiology - a brilliant writer and someone I really admire.