BRAIN TEASERS

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What a winning combination?

The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.

Correct answers: 4

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Thinking about the future

Q. How does a man show he's planning for the future?

A. He buys two cases of beer instead of one.

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First computer virus

In 1983, U.S. student Fred Cohen presented to a security seminar the results of his test - the first documented virus, created as an experiment in computer security. Cohen created this first virus when studying for a PhD at the University of Southern California. Others had written about the potential for creating pernicious programs but he was the first to demonstrate a working example. In the paper, he defined a virus as "a program that can 'infect' other programs by modifying them to include a ... version of itself". Cohen added his virus to a graphics program called VD, written for a Vax mini-computer. The virus hid inside VD and used the permissions users had to look at other parts of the Vax computer to spread around the system.

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