Do you like to wear headphones to listen to music? How long do you usually listen continuously? In daily life, many habits can inadvertently affect listening. In the latest episode of the TV program "Opening Speech", Wu Hao, Chairman of the Otolaryngology Head and Neck Surgery Branch of the Chinese Medical Association and Dean of the Ninth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, introduced that the frequency of sound that normal people can hear is between 20 Hz and 20000 Hz, and the intensity is between 0 dB and 20 dB. To protect your hearing, wear headphones continuously and listen to music for no more than 30 minutes. It is best not to turn the volume up to two-thirds of the maximum. In the program, Wu Hao also shared a lot of "cold knowledge" about listening, let's watch together. Why is it the most "model worker" organ? Wu Hao introduced that human hearing starts from 24 weeks of embryonic development and never stops working until old age, making it the most "model worker" organ. There are 15000 hair cells in the inner ear that sense sound, and every time you hear noise or experience trauma such as falls and falls, it can lead to hair cell loss. In addition, improper lifestyle habits can also lead to hearing loss. Wu Hao once visited a patient who fell asleep listening to music while wearing earphones at night. The music played all night, and the next day, he developed symptoms of unclear hearing in both ears. How to detect children's hearing problems early? When checking the hearing of young children, small earphones are inserted into their ears. People around can't hear any sound, but what will children hear? Wu Hao revealed that this examination is actually an automatic feedback and a screening method used by otologists. Children will hear the sound of 'ticking', and upon receiving the sound, feedback will automatically form in their ears. "Wu Hao introduced that newborn hearing screening is the best method for early detection of hearing problems. For many years, he and his team have attempted large-scale newborn hearing screening in the delivery room. From 2001 to 2010, neonatal hearing screening was introduced nationwide. After screening problems in the delivery room, immediate intervention treatment such as hearing aids and cochlear implants was given, which increased the national coverage rate of newborn hearing screening from 29.9% in 2008 to 86.5% in 2016, significantly advancing the age of diagnosis and intervention. Starting from 2019, Wu Hao and his team conducted auditory brainstem implantation surgery to further improve the auditory reconstruction effect of congenital deafness. At the program, Wu Hao also received a very special note that read: "Dear Dean Wu, my name is Gu Song Kashi. With your help, I can not only speak but also write, and I have almost no problems communicating with others. Thank you for helping me perform surgery, allowing me to hear voices, learning to speak, and establishing a closer connection with the world..." 14 years ago, Wu Hao performed surgery on Gusong Kashi, who was only 5 years old at the time, which was also the first cochlear implant surgery in Tibet. Looking at Casey, who was now standing tall and graceful, Wu Hao couldn't help but feel his eyes moist. Gusong Kashi also prepared a gift for Dean Wu to express his gratitude - a string of heavenly pearls, symbolizing "Zhasidle, good teacher". Wu Hao was very moved and said, "When we had surgery, we had hoped that she could go to school and enter society normally in the future. Today, this wish has finally been realized