Luckily, Hawking had the technology to help him along his journey. One of the things Hawking needed to help him with his ALS was a lecture program. This device helped Hawking's speech be clearer so people could understand him better. And he also had an iBrain. It was a device that picked up brain signals and interpreted them so people could better understand Hawking and people with ALS (Biography.com Ed.). Stephen Hawking was very famous for several reasons. One thing he did was write several books. His most famous book was undoubtedly "A Brief History of Time", which was very successful even though people asked for more, so Hawking released many other books and sequels. Hawking also did famous things in physics and cosmology, which were his main departments of study (Biography.com Ed.). He was even able to prove, thanks to quantum theory and general relativity, that black holes actually emit radiation.