Hi, I write for the BBC News website. I'm putting together a piece on the enduring fascination with the Rubik's cube. I am looking to talk to real fans and experts, people who have devoted a lot of time to solving the puzzle. I'll also mention records and quirky feats. Would be great to talk to you if you are a serious fan. Please email me at tom.decastella@bbc.co.uk and if it sounds good we can have a quick chat. Best, Tom