Vienna - Using quantum physics, researchers said they communicated for the first time via a completely tap-proof telephone network in Vienna on Wednesday.

Scientists involved in the SECOQC project, funded by the European Union, found a way to create an encryption key based on the polarisation of photons, subatomic particles that carry light.

"Classic keys can be hacked by supercomputers, but not in this case," said Anton Zeilinger, a quantum physicist at the Vienna University.

Mountain View, California  - Google is set to expand its lead in the online advertising market by allowing advertisements within games, the company announced Wednesday.

Google would use its new so-called AdSense for Games programme to sell in-game video ads, the world's leading search engine provider said.

The company also hopes to make profits from its YouTube video platform by introducing a new "Click to Buy" programme allowing users to buy digital tunes from Apples iTunes or Amazon. com without leaving the site.

London, Oct 8 : Scientists in Japan have unveiled a life-like robot that looks like a five-year-old girl.

The team at Osaka University''s robotics department behind the robogirl, known as Repliee R-1, has claimed that it is the most realistic robot suit ever created.

Repliee R-1 has flexible silicone skin and contains dozens of sensors and motors, enabling it to move and interact with its surroundings like a human, reports the Telegraph.

Melbourne, Oct 8 : In a remarkable discovery, scientists have for the first time unravelled bacteria''s stress buster— a "co-ordination centre” that directs a bacteria''s defence systems to fight off external threats and stresses.

The team of British and Australian researchers has shown how the centre alerts the bacteria to danger and prompts it to create proteins to negate the threat, reports ABC Online.

Washington, October 8 : Researchers at the University of Leices

Washington, October 8 : Rice University in Houston is running an advanced computer security course wherein students are taught just how easy it is to wreak havoc on the computer software used in electronic voting machines.

Associate Professor Dan Wallach, Director of Rice''s Computer Security Lab, tests his students in a unique real-life experiment as part of his advanced computer science class—instructing them to do their very best to rig a voting machine in the classroom.

In the first phase, the teams pretend to be unscrupulous programmers at a voting machine company. Their task would be to make subtle changes to the machine’s software that can alter the election’s outcome without being detected by election officials.