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![Alan Dambach developed tremors that caused his hands to shake uncontrollably. His condition made it difficult to work on his family's tree farm in Fombell, Pa.](https://woub.org/wp-content/uploads/2018/07/essential-tremor-1-860181cbf03a329096f545794d19e06b0e2a23a3-e1531150383462-900x422.jpg)
How Highly Focused Sound Waves Steadied A Farmer’s Trembling Hand
By: Jon Hamilton | NPR
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Tree farmer Alan Dambach’s tremor got so bad he couldn’t read his own signature. Then he tried a new procedure that uses sound waves to destroy specific brain cells.