Until 15 February 2001, visitors to Berlin's Staatsbibliothek am Kulturforum can see an exhibition of artefacts connected with quantum physics. These include a reconstruction of Max Planck's laboratory of 1895 (above), where the germ of quantum theory took root, and a page from Einstein's 'Zurich notebook', dating from around 1911. Einstein was trying to convince his colleagues that Planck's law was a break from classical physics. Shrödinger's cat was unavailable for public appearances.

Credit: MPI/EINSTEIN ARCHIVES, HEBREW UNIV. JERUSALEM