How did ancient people use bifurcated branches to find water? What is the principle? Is this method reliable?

The bifurcation you mentioned has many names, such as "hexagram" and "dragon ruler". The English name "Dowsing Rod" has a history of 5,000 years in China and the West. The Cambridge Encyclopedia Dictionary translates it as "exploring water sources or veins with divining sticks", which is a traditional method to detect underground objects such as underground water sources. The prospector walked through the exploration area with a fork-shaped stick or pendulum clock and observed the swing of the instruments used. This method is very popular, but the empirical research results of its effectiveness are inconclusive.

Now the basic mature theory is that it is difficult for human senses to detect many phenomena in the universe. For example, light can't be seen except for the seven main colors in the light combination, such as infrared rays and ultraviolet rays. For sound waves, the frequency (tone) of sound waves that people can hear is also very small, and people cannot detect other electric waves. Radio waves exist, not superstition. Therefore, things that are invisible and intangible do not exist. I wonder how many other radiation waves and electromagnetic waves there are. People cannot detect, see or hear kinetic energy. On average, people will generate 70 millivolts of electricity, some people will generate higher electricity, and some people will generate lower electricity. No matter what substance, it will generate the same level of electricity. If substances move through displacement, they will generate electricity because of mutual friction, such as running water, water rubbing against each other or rubbing against the coast, and different combinations of substances will also generate micro-electricity because of different charges. The dragon hunting tool is to find its power supply or its trace through its sensitivity to electricity. The found power supply can let people know the underground mine source, or what happened officially, find traces, and let people predict. It's really amazing.