Einstein wrote a letter about the theory of gravity in German in 1928 in Berlin, and sent it to his colleague, a mathematician.
Farriintan ayaa ahayd mid uu gacantiisa ku qoray caalimku uuna kaga hadlay ra'yigiisa aragtida Gravity Theory , waxa uu qoray 1928 isagoo Berlin jooga, waxaanuu u diray saaxiibkii oo isna ahaa caalim kale oo dhanka Cilmiga Xisaabta ku takhasusay.