Future historians will be puzzled by this one.
How do bubble chambers detect particles?
A bubble chamber often contains liquid hydrogen. Charged particles entering the chamber would interact with the electrons transferring some of their energy via the Coulomb force. This initiated boiling and thus led to bubbles being formed. The electrons of the hydrogen atoms thus acted as the detectors within the chamber. Only charged particles cause tracks in bubble chambers, as neutral particles will not interact via the Coulomb force.
"2 Atoms in a Molecule" by Noah and the Whale
Last night I had a dream we were inseparably entwined,
Like a piece of rope made out of two pieces of vine.
Held together, holding each other, with no one else in mind,
Like two atoms in a molecule, inseparably combined.