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She was operated on the next day and doctors cut open her finger to clean and remove the infection around the knuckle joint.

The covered parts of my hands are the ones really impacting the machine, not the fingertips greased up with street grime or the first knuckle joints torn up from sharp strings.

And indeed, the collapse of the “mathematical” bubbles in the knuckle joint generated sound waves that look just like the ones created in real life, the team reports today in Scientific Reports.

The volunteer inserted the fingers one at a time into a tube connected to a cable that was slowly pulled back until the knuckle joint cracked.

I went to the doctor and found I had a linear fracture in the knuckle joint.