The original footage of one of the first attempts to climb the highest mountain in the world is showing at the Aros Centre in Portree, Isle of Skye, from 25th to 28 November. The climax of Mallory and Irvine's 1924 expedition up Everest is still shrouded in mystery. Even today, nobody knows for certain whether or not Mallory and Irvine died before they reached the summit. Though the end of their adventure is lost, footage of their journey still survives. We have Captain John Noel to thank for the images of Mallory and Irvine, appearing as ants against an unending…