29 years ago, on January 19, 1996, scientists uncovered the mystery that chimpanzees can¡¯t speak. Chimpanzees are the most similar to humans, and studies showed that some chimpanzees are trained not only to master certain techniques, gestures, but also to use computer keyboards to learn words, their ability to even over two years old children. However, the researchers can¡¯t train them to speak loud in human language, which is why? In January 1996, American scientists discovered that chimpanzees can laugh when they are swallowed, breath while laughing, and sound like the sound of a chain, while humans are temporarily stopped when they speak or laugh, because it is able to control the membranes and muscles related to the voice. Scientists believe that the key to being able to speak is to control