Einstein (1907b) ayaa ka hadlay su'aasha ah in, in jidhka adag, iyo sidoo kale dhammaan xaaladaha kale, xawaaraha macluumaadka ka badan kartaa xawaaraha iftiinka, iyo sharaxay in macluumaadka lagu gudbin karaa xaaladaha ku hoos jira ee la soo dhaafay, sidaas sababaha la jebin lahaa. Tan iyo markii ay tani ka soo horjeeda asal ahaan ka dhanka ah waayo-aragnimo kasta, xawaare superluminal la maleeyo waa wax aan macquul aheyn. Wuxuu intaa ku daray in a firfircoon ee jirka adag waa in la abuuro gudahood qaabka of SR. Ugu dambeyntii, Max Born (1909) in koorsada ee uu shaqada kor ku xusan oo ku saabsan dhaqdhaqaaqa dardar, isku dayay in ay ka mid yihiin fikradda ah jidhka adag galay SR. Si kastaba ha ahaatee, Paul Ehrenfest (1909) ayaa muujiyay in Born ee hogaaminaya fikradda la yiraahdo Ehrenfest paradox, taas oo, sababtoo ah is-kaalinta, xawaaraha of degrees of freedom wareega waa la gaabin karaa halka disk iftiinka
xawaaraha iftiinka ka sarreeya