Google just published the answer key to the human genome. 9 billion possible single-letter DNA mutations, each one scored for how much damage it does, all precomputed into a 1 petabyte database that any academic can search for free. Here's why that's a bigger deal than it sounds. Until today, if a scientist wanted to know whether a specific mutation mattered, they either ran an AI model themselves or tested it in a wet lab. Lab work on a single variant takes weeks. Even if checking one…