Page last updated at 6:23 GMT, Wednesday, 26 May 2010 7:23 UK
Researchers have found that implanted identity chips can pick up computer viruses.
Reading University's Mark Gasson conducted an experiment to show how radio frequency identity (RFID) chips could become electronically infected.
He explained to Rory Cellan-Jones the risks involved with the new technology including its effects on medical implants such as pacemakers.
The US has confirmed it will hold naval exercises with South Korea, after a report blamed the North for the sinking of a Southern warship, officials say.
The Pentagon said the joint anti-submarine and other military exercises would start "in the near future".
South Korean President Lee Myung-bak earlier froze trade with Pyongyang, vowing to punish those who carried out the attack.
North Korea has said it will retaliate for any action taken against it.
The country's main newspaper called the investigation an "intolerable, grave provocation".
'Unequivocal support'South Korea has said it will refer the North to the UN Security Council in response to the sinking of the Cheonan - and the resulting death of 46 sailors - in March.
In a move endorsed by the US, President Lee said in a televised address that Seoul would no longer tolerate "any provocative act by the North and will maintain a principle of proactive deterrence".
| By Maggie Shiels Technology reporter, BBC News, Silicon Valley |
 YouTube wants users to discover and shape the world through video |
Video sharing website YouTube now gets more than two billion hits daily.
That's nearly double the number of people who tune into the US's three prime time TV stations combined, its owners Google have said.
The news comes as the site celebrates the day five years ago when the first beta version of YouTube was launched.
"I see this great growth opportunity in the online video market and we are positioning ourselves to be a leader," co-founder Chad Hurley told BBC News.
"We are a stage and we give everyone in the world an opportunity to participate and that is being a video platform for creating a solution for people to not only upload and distribute their videos on a global basis but to find and share videos."
He also said that while the two billion downloads marked a real milestone "I feel we have much further to go.
