Secret codes for spies?

Secret codes for spies?

Althought we are not spies, we still use lots of codes,such as bar codes .

when we go to the supermarket ,we can see the bar codes on the goods.

according to my major in high school, I know that the function of bar

codes is to show where the good made in and it pattern.

Morse codes is one of the famous codes, we knnow it's function is for communicating each other secretly.From World War. Morse code is still used today.

In this article we can know what the Enigma machine is .

A number of the England's brightest scientists and mathematicians were recruited to break the job.However, no one knew what their job excetly is, because they have to take their job as top secret.

Don't believe everything you read

Don't believe everything you read

Nowadays, we should pay attention on what we read or see because that is not always ture.In TV, we can read the news or get entertaintment from it, however before we accept if we should think twice, that can protect us not to be tricked.

Spam is a new problems in our society, therefore we should be careful about who talks in thephone,especially when we talk to someone who is trying to get our imformation or the numbersof some important card.