From the Giza pyramids to the pharaonic tombs of Luxor, Egypt's ancient monuments are holding onto mysteries which researchers now aim to unravel with cutting edge technology. For more than 200 years since Napoleon Bonaparte landed in Egypt with a retinue of scholars who laid the groundwork for modern Egyptology, experts have used science to unlock the secrets of the country's ancient treasures. In the 21st century, the scientists have been using electronic devices and chemical testing to date artefacts.