Ten Things You Need to Know Today: Monday 25 Jun 2012

David Cameron today launched a proposed clampdown on Britain's "culture of entitlement". Among "difficult" reforms he wants to cut benefits for families with three or more children and an end to housing benefits for most under-25s. The PM believes families struggling to cope outside the welfare system have reason to be resentful of those who enjoy state benefits.

US tennis champion Venus Williams was knocked out of the Wimbledon Championships today, after Russia's Elena Vesnina beat her 6-1, 6-3. Williams, who has won five Wimbledon titles, has been battling Sjogren's syndromean, an incurable disease that causes chronic fatigue.

Two members of the computer hacking group Lulzsec have pleaded guilty to attacking websites, including those belonging to the CIA and the Pentagon as well as the Serious Organised Crime Squad, at Southwark Crown Court. Ryan Cleary, 19, and Jake Davis, 18, admitted targeting various websites but denied posting confidential data on the internet.

Scientists from Stanford University are developing a machine to "hack into" physicist Stephen Hawking's brain, "by-passing his body" to allow him to communicate through brain waves as his condition with motor neurone disease deteriorates. Professor Philip Low hopes to demonstrate his "iBrain" machine at a conference in Cambridge in July.

Lonesome George, a giant tortoise thought to be the last of his subspecies, has died. Scientists believe he was about 100 years old. For years environmentalists tried to get him to reproduce with females from a similar subspecies on the Galapagos Islands – but to no avail.