A woman is selling an extremely rare 1970s IBM computer like that which helps power the US nuclear system. Faith Warner, 38, decided to auction off the huge Series 1 machine after it spent decades gathering dust in her garage. She says the computer model originally sold for anything between £100,000 to £150,000 - but she has listed it on Ebay with a modest starting price of £5,000. Ms Warner said: 'My dad used to run an engineering firm but in his spare time he wrote for a PC magazine and loved collecting old technology that he would try to fix. 'My father died six years ago and over the years my mum has got rid of some bits and the collection has dwindled - but this one was left behind, mainly because it's so big.' Ms Warner, who runs a retreat in north Devon, researched the IBM Series 1 after uncovering it under a tarpaulin two years ago.

There are moments that live on in business history. One of them is the cry: "Mr Watson come here, I want to see you," spoken by Alexander Graham Bell back in 1876, in the world's first telephone conversation. Another significant moment was the day in 1997 when the IBM computer called Deep Blue beat the then world champion Gary Kasparov at chess. And then another IBM moment in 2011 when an even more intelligent computer called Watson -after the IBM founder Thomas Watson and his IBM chief executive son Thomas - won the TV game Jeopardy against human competition. These last two IBM contests demonstrate - we're told - big advances in machine intelligence.