In a "Practical Engineering Knowledge Sharing Channel", we also saw a tutorial on the use of tungsten light bulbs, matches, gasoline and other items to make improvised explosive devices. Such explosive devices are often placed in cardboard boxes, which will be triggered whenever someone tries to move the cardboard box. . In the past few months, even bombs have appeared on the streets of Causeway Bay, and the police have had to dispatch bomb-removal troops. The movie-like plot appears in Hong Kong in reality.2022's hottest money making projects,