I suffered 30% brain damage in a car accident, and medics charged 4 million UK pounds ($6 million) for my rehabilitation. I was just about walking and talking.
8 years later I was on a PhD at Sheffield University, and another PhD student mentioned the use of ultrasound to boil off water.
This caused the removal of damaged cells – which are them repaved by the body.
20 1 minute applications of 8W 1 MHz ultrasound would have totally fixed me 9ni my coma – cost 30 UK pounds.
And I would never have woken with a shattered body and brain.