Current to the anterior midcingulate cortex gave both patients an increased heart rate, physical sensation in the chest or neck, and “anticipation of challenge coupled with strong motivation to overcome it”
Italy has been using this for buses since 2003.
We can overnight a padded envelope full of 32GB drives anywhere in the country. That's hard to beat when you need to send a few dozen gigabytes in 12 hours.
If you didn't have to work so hard, you'd have more time to be depressed.