An Albert Einstein “puzzle” has been solved thanks to a missing manuscript page emerging in a trove of his writings newly acquired by Jerusalem’s Hebrew University, officials announced Wednesday.

The handwritten page, part of an appendix to a 1930 paper on the Nobel winner’s efforts towards a unified field theory, was discovered among the 110-page trove the university’s Albert Einstein archives received some two weeks ago.

Hebrew University unveiled the collection to coincide what would have been Einstein’s 140th birthday on March 14.