How does "Frozen Man" Hawking control the lights?

On March 14, 2018, the world lost a true legend. Stephen Hawking, a brilliant physicist and one of the greatest minds of our time, passed away at the age of 76. Despite being diagnosed with amyotrophic lateral sclerosis (ALS), also known as "Lou Gehrig's disease," he lived an extraordinary life that inspired millions around the globe. Hawking was confined to a wheelchair, unable to speak or move freely, yet his mind remained as sharp as ever. He defied all odds, becoming a symbol of resilience and intellectual power. His contributions to science, especially in the fields of cosmology and black holes, have left a lasting legacy. Among his many achievements, Hawking authored several groundbreaking books, including *A Brief History of Time*, *The Universe in a Nutshell*, and *The Grand Design*. These works made complex scientific concepts accessible to the general public and earned him a place among the most influential scientists of the modern era. Beyond academia, Hawking appeared in popular TV shows like *The Big Bang Theory* and even had a cameo in *Star Trek: The Next Generation*. His charisma and wit made him a beloved figure, not just in the scientific community but across the world. He was also one of the first scientists to embrace social media. In 2016, he launched a Weibo account and quickly gained over 3 million followers, showing how technology could bridge the gap between science and the public. In his daily life, Hawking used advanced assistive technologies to communicate and control his environment. His wheelchair was more than just a mobility aid—it was a sophisticated device equipped with speech synthesis, text-to-speech software, and even remote control capabilities for his home. Over the years, as his condition worsened, his communication system evolved. Initially using a switch on his hand, he later transitioned to a cheek-switch system, allowing him to type by moving his facial muscles. This innovation enabled him to continue sharing his thoughts with the world. His smart wheelchair included a powerful computer with a Core i7 processor, an infrared remote control, and a 12-inch display screen. Through this system, he could write speeches, send emails, and even use instant messaging. Hawking’s home was also equipped with an intelligent lighting system. It used light sensors, motion detectors, and time-delay switches to automatically turn lights on and off based on activity and ambient light levels. Despite his technological advancements, Hawking was cautious about artificial intelligence. He once warned that if AI developed without proper safeguards, it could pose a serious threat to humanity. Stephen Hawking may have been physically limited, but his mind was limitless. His life was a testament to the power of perseverance, curiosity, and the human spirit. He will be remembered not only as a great scientist but as a true icon of inspiration. Editor: Yan Zhixiang

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