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"What scares me about this is that you know more about my customers after three months than I know after 30 years."
So said Tesco chairman Lord MacLaurin after Edwina Dunn and her husband Clive Humby (pictured) gave a presentation to the supermarket chain's boardroom in 1994.
What the couple had to say would change the way many of us shop forever.Find out how here...
BBC News, Washington
tweets: Crews gathering outside justice centre where #grandjury meets. Waiting game continues. #Ferguson
The community of Ferguson is waiting to hear whether a US grand jury will indict Darren Wilson, the white police officer who shot dead Michael Brown, an unarmed black teenager, in August. The jury is set to meet at 17:00 GMT.
BT's shares have gone up by 11.40p - or 3% - at 391.40 pence this afternoon.
It comes after the telecoms giant announced it wasin talks with Telefonica about buying the O2 mobile network from the Spanish firm.
More than 30,000 birthday cards have been sent to a man in France after his mother posted a request on Facebook which went viral.
Manuel Parisseaux, who turned 30 on Saturday, has got Down's syndrome.
"We got cards from everywhere: Sri Lanka, Chicago, Hong Kong and sometimes with child's drawings," said his mother Jacqueline Parisseaux.
"I don't understand why it got so big. Manuel is like us, he is moved to tears."
BBC Newsbeat's most read story right now is its discovery that Bob Geldof's plea for people to keep downloading Do They Know It's Christmas? over and over again is easier said than done.Find out why here...
North America editor
tweets: #Hagel elegant, generous speech, but gives NO indication why he has tendered resignation; Perennial political game now set to unfold on #hagel resignation with the question: was he pushed or did he jump?
Police and security services are to get new powers to tackle the growing threat of terrorism to the UK. Announcing the move, Theresa May said 40 terror plots had been foiled since the 7 July bombings in London in 2005. The threat level has been at "severe" since August.What measures have been announced?
BBC Middle East editor
One story that's developing is news that the sixth man to be arrested over the 1993 murder of Stephen Lawrence (pictured)will not be prosecuted.
The man in his 40s was arrested on 23 December last year. The Crown Prosecution Service said there was insufficient evidence to prosecute.
BBC Go Figure
The most engaged-with article on the BBC's website at the moment isthe moving story of Sumarti Ningsih - found murdered and decomposing in a suitcase on a Hong Kong balcony. BBC Indonesia editor Karishma Vaswani has been to the 23-year-old's home village on the island of Java, and spoken to her distraught family and friends.
TV designer Laurence Llewelyn-Bowenhas apologised after the Christmas attraction he helped to create was forced to close because of complaints.
He said it was "time for sleeves to be rolled up" at The Magical Journey, near Sutton Coldfield, which was branded a "rip-off" by some visitors.
What's popular and why
A video apparently showing a maid physically abusing a young child in Uganda has been watchedmore than 21 million times in just four days on Facebook.
The disturbing video has since been widely shared on the internet, provoking horror and upset from Uganda to California, says#BBCtrending.
The mother of a newborn baby who was abandoned in a drain in Sydneyis to be charged with attempted murder.
Police say the baby boy, who is in a serious but stable condition, may have survived up to five days in the drain.
BBC Magazine has beenlooking at how it was possible for the baby to have survived.
Argentina has expressed discontent to the BBC over its handling of complaints about a Top Gear special filmed in the country. The show's stars and crew were forced to abandon filming last month amid angry protests over a car number plate that appeared to refer to the Falklands War.
The most shared stories on the BBC News Website right now are:1: US police kill boy carrying fake gun2: New computer spying bug discovered3: The couple who changed the way we shop4: The writer who foresaw the rise of the totalitarian state5: 'Time is right' for new terror powers
US media is reporting thatChuck Hagel is to stand down as US defence secretary.
President Barack Obama is expected to announce his resignation just after 16:00 GMT (11:00 EST).
It's currently the most read story on BBC News - we'll bring you the very latest as we get it.