Materials follow the 'Rule of Four‚' but scientists don't know why yet
Favicon 
phys.org

Materials follow the 'Rule of Four‚' but scientists don't know why yet

Scientists are normally happy to find regularities and correlations in their data—but only if they can explain them. Otherwise‚ they worry that those patterns might just be revealing some flaw in the data itself‚ so-called experimental artifacts.