Using quantum entanglement to measure rotation of the earth

 A new technique has been devised that allows physicists to use quantum entanglement to measure the rotational rate of the earth. This is yet another example of the expanding set of experiments that are using quantum mechanical phenomena to measure all sorts of other phenomena, in addition to new quantum mechanical properties. There is a hope that experiments like this will lead to new insights of how quantum mechanics and gravity are related - the Holy Grail of physics is to construct a theory encompassing general relativity (gravity) with quantum mechanics and the Standard Model.  

This is an example of how experimental scientists can devise clever experiments with different phenomena present to expand the knowledge base of a field in order to hunt for new theoretical insights, coming from the observational data. I personally enjoy the back-and-forth interplay between theory and experiment in science!