As expected, the waves can only travel in one direction” Image source: Nicolas Noiray / ETH Zurich The researchers made this new discovery by improving upon a 2014 design from the University of ...

Sound waves can be measured in phase and amplitude without destroying them. In a sense, the cat stays both alive and dead, and researchers can listen in without opening the box.

The sound waves essentially created microscopic bubbles in the salt solution. Then, when the bubbles collapsed, they created tiny bursts of heat and pressure which triggered a reaction with the glass.