Scientists Made the World’s Largest Time Crystal “We determined the material time for an aging sample of the glass-former 1-phenyl-1-propanol after temperature jumps close to the glass transition from the time-autocorrelation function of the intensity fluctuations probed by multispeckle dynamic light scattering,” the paper reads. “These fluctuations are shown to be stationary and reversible when regarded as a function of the material time.” While this proves the existence of reversible time, that doesn’t mean this paper describes a physical process of rearranging molecules and turning back the clock on a glass’s age. “It was a huge experimental challenge,” condensed matter physicist from the Technica University of Darmstadt and lead author Till Böhmer said to ScienceAlert about his team’s research. “However, this does not mean that the aging of materials can be reversed.” As with most breakthroughs, finally finding physical evidence of time-reversibility only brings up more questions—chief among them being how universal this characteristic is to aging in general. To use a particularly poignant turn of phrase, only time will tell. So if they do discover something here it may explain UFOs are nothing more than vessels from a future time period. It explains why they all just disappear.