Nothing (Original: Which are the most common everyday phenomena that we don't properly understand? Off the top of my head: • Lightning (how does it happen?) • Sleep; dreams (why do they exist?) • Glass (thermodynamics of formation) • Turbulence (when does it start?) • Morphogenesis (how does) #EverydayMysteries #ScienceCuriosities #NaturalPhenomena #Thearticledoesnotreferenceanyspecificcountries.Therefore #therearenocountrycodestoreturn.
