The professor attempts to solve the 2,000-year-old mystery of the legendary artefact. Plus: behind the bright lights of Las Vegas. Here’s what to watch this evening The professor attempts to solve the 2,000-year-old mystery of the legendary artefact. Plus: behind the bright lights of Las Vegas. Here’s what to watch this evening 9pm, Sky History Alice Roberts, professor of public engagement in science, tries to solve the 2,000-year-old mystery of the holy grail - and asks if the relic was really