In 1922 Howard Carter made a stunning discovery - King Tutankhamun's tomb. Crammed inside were over 5,000 priceless artefacts of every type - from gold slippers to finely tooled daggers, the remains of chariots and the boy king's show-stopping solid gold death mask. For the first time in 90 years these incredible treasures are being brought back together as the starring attraction in Cairo's brand-new #750 million Grand Egyptian Museum. Now, advances in modern technology are uncovering new secrets about a boy king who died before his twentieth birthday and the ancient land he ruled. King Tut's incredible death mask - 24lbs of pure gold - has always been the subject of debate with many scholars believing its damaged nameplate, known as a cartouche, and different colours of gold meant it was never made specifically for him. It was more likely made for his female ancestor, Nefertiti. And, until now, the evidence seems to back that theory up. New analysis of some of his many burial goods, including 'Shabtis'- miniature effigies that were meant to act as servants in the afterlife- suggest up to a quarter of all the treasures in the tomb were made for someone else. Closer analysis at the Grand Egyptian Museum of the funeral beds also paint a picture of a rushed burial where the funeral planners were caught by surprise at Tutankhamun's sudden, unexpected death and there wasn't enough time to provide the regal burial a pharaoh would expect. So could the death mask- the world's most famous ancient object- also be a reused artefact from another tomb? Now the mask has been subjected to the most forensically intense investigation ever to try and answer that question once and for all. The result flies in the face of much of the other evidence from the tomb. Tutankhamun may have been buried with many second hand goods but the mask wasn't one of them - the pharaoh's death mask was made especially for him and in only 70 days.