19523

Your article didn’t specify how strong the ultrasonic waves were or if any special conditions were required for these bubbles to form. I am curious to know if there’s a difference between the ultrasonic waves mentioned in your article and those in ultrasound exams of pregnant women.

Andrea Bikfalvy
Dowagiac, Mich.

The article made me wonder whether the ultrasonic waves of naval sonar can “rattle” an aquatic mammal’s brain.