Scripts include Linear B, Egyptian hieroglyphs, and cuneiform scripts. Some Sumerian logograms were written with multiple cuneiform signs. Babylonian cuneiform tablets contain problems reducible to solving quadratic equations. In particular, the Old Assyrian cuneiform employed many modifications to Sumerian orthography. The elucidation of cuneiform led to the decipherment of Sumerian. Hittite orthography was directly adapted from Old Assyrian cuneiform. Hittite was written in an adapted form of Peripheral Akkadian cuneiform orthography from Northern Syria. Fomenko's studies ignore the abundance of dated astronomical records in cuneiform texts from Mesopotamia. More than 16,000 clay tablets with cuneiform texts were discovered. The task of deciphering the Persian cuneiform texts was virtually accomplished. Scribes wrote by inscribing them with cuneiform script using a blunt reed called a stylus. There are dozens of cuneiform records of original Mesopotamian eclipse observations. Herbert is rarely mentioned in standard histories of the decipherment of cuneiform. The early logographic system of cuneiform script took many years to master. The Hittites used a variation of cuneiform called Hittite cuneiform.