Luckily Hawking had technology to help him on his journey. One thing Hawking had to help him with his ALS was a conversation program. This device helped Hawking's speech be clearer so people could understand him better, and it also had an iBrain. It was a device that collected brain signals and interpreted them so that 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 definitely "A Brief History of Time", which was very successful if people asked for more, so Hawking published many other books and sequels. Hawking also did famous things in the fields of physics and cosmology, which were his main departments of study (Biography.com ed.). He even managed to demonstrate with quantum theory and general relativity that black holes actually emit radiation