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The author of a worm which caused widespread disruption to PCs and networks has attempted to repair the damage by creating software to remove it. However, security experts say the removal software is considerably less effective than the original worm.

While the One Laptop per Child (OLPC) project has taken on the aura of a charity – if you believe what you read in the mainstream media – the hard numbers tell a different story. Analysts say the component suppliers that have taken a gamble on the project stand a fair chance of coming out winners.

Successful trials of a Viagra substitute have lifted the share price of its developer, Dong-a PharmTech of Korea. The drug, Zydena, or Udenafil, is already one of Korea's best selling pills, despite facing a stiff challenge from Viagra.

What the company describes as 'intercourse completion rates', were doubled to almost 70 percent for couples using the highest doses of the drug in the trial. The rate for those using a placebo was 38 per cent.

UPDATED MARCH 27: Nintendo has changed the design of its Wii games console to combat modchips, modchip developers in China have charged. Several design changes can be seen on new Wii motherboards, in photographs that appear to support these claims.

Some sources allege that the changes make it more likely the Wii could be damaged by modchip installation, we have not been able to verify this, however.

Surgeons could perform operations without cutting the skin by using a new magnetic manipulation technique, the scientists who invented it say. They hit upon the idea after seeing teenagers use strong magnets to attach jewelery to their lips without piercing them.

In animal tests, the researchers were able to remove a kidney using the technology. Magnets outside the body were used to position a camera and surgical tools within. More details at EurekaAlert.