Manev's gravitational theory ran counter to
Albert Einstein’s theory of relativity. Einstein's less-than-glowing assessment of Manev’s theory had complicated his colleague’s prospects for a full professorship at Sofia University. In July 1929, Einstein wrote an apologetic letter to Manev, offering to help make the situation “good again.” The typewritten letter, signed “A. Einstein,” belongs to Manev's family and was subject of an art restoration project at the Winterthur/University of Delaware Program in Art Conservation (WUDPAC). The letter was creased, partly from being folded, mailed, and tucked into a book for safekeeping during World War II. The creases were retained, removing the adhesive tape without damaging the typed words on the paper. ==References==