  The recently published Derveni Papyrus, discovered in a tomb in northern Greece, contains a commentary on an Orphic poem. The commentator discusses some passages of Heraclitus in connection with the poem, namely B3 + B94 (which may have been thus joined in Heraclitus’ book) (column 4). See Betegh 2004. The Oxyrhynchus Papyri (vol. 53, no. 3710) also show that Heraclitus was interested in determining the days of the lunar month and thus in scientific questions. See Burkert 1993.