Regarding “Scholar defied ALS to become pre-eminent physicist” (Mar. 15): I woke up Wednesday morning to the terrible news that Stephen Hawking died. While I never met the man, and didn’t really understand all he was saying about black holes, I learned a lot from him about what is possible for people with ALS (PALS). At his diagnosis, Hawking was reportedly told that he would only live a few years and that there was nothing that could be done about it. He beat his prognosis by many decades. While he appeared to decline a lot in the beginning of his illness, his progression seemed to slow, or even stop in later years.