I learnt last year that measles causes immune system amnesia. This during a time when more than a few people are against vaccines (in Kenya! Where vaccination wasn't widespread 50 years ago! Families lost _children_!) and are denying folks access to lifesaving care like the Covid, HPV, polio and other childhood vaccines. This letter from Roald Dahl is so touching for how it highlights what it means to know that something now exists that may have saved your child. https://fs.blog/roald-dahl-letter-daughter/