This week, more than 6,000 hackers from around the world gathered at Defcon

According to Cnet, more than 6000 top hackers from different areas of the world gather in Las Vegas this weekend. They celebrate, exchange ideas, and discuss new topics and crazy ideas. They also attend Defcon, the world's largest hacker conference. During this time, they conduct intrusion simulations in groups, known as war games, which are just for entertainment among hackers. Many of the products they develop have high practical and scientific research value, although some are just American humorous jokes.