Students in China have been using a pen that can conceal writings. The pen, also called "invisible pen", uses special ink which left no marks on papers, while can be read with a mini purple lamp on the other end of the pen. The pen is popular with students in Wuhan who are using it in exams or writing love letters.
"The pen should totally be forbidden. It is bad to the mental health of the students," said the principal of a local school. But students disagree.
A girl student named Wang said: "The pen has irreplaceable advantages. My mom always loves to peek at my diaries, and with this pen, she has no idea," reports Chutian Golden Newspaper.
Νίκος από Πάτρα ζήτησε Χαμογέλα στα παλιά.
A television is being developed that allows viewers to smell what is on screen. Scientists at Sony in San Diego, California are creating the small device in the set will send out harmless ultrasound signals to the brain. It means that viewers will be able to smell and taste a dish on a cookery programme reports The Sun. Work on the device has been going on for five years but news of its development came to light after the company applied for a patent. 
The digital television revolution means that Earth is less likely to be discovered by aliens, according to an expert.
Olympic president Jacques Rogge has warned that there could be more positive dope tests in Athens than at any other Games in history.
Record numbers of athletes will be tested, new tests developed and samples frozen so they can be analysed retrospectively.